 {"id":3716,"date":"2022-11-22T09:56:26","date_gmt":"2022-11-22T04:56:26","guid":{"rendered":"https:\/\/themasterchemistry.com\/?post_type=web-story&#038;p=3716"},"modified":"2022-11-22T10:42:46","modified_gmt":"2022-11-22T05:42:46","slug":"going-to-the-femoral-head-of-class-to-explain-dinosaur-evolution","status":"publish","type":"web-story","link":"https:\/\/themasterchemistry.com\/web-stories\/going-to-the-femoral-head-of-class-to-explain-dinosaur-evolution\/","title":{"rendered":"Going to the &#8216;femoral head&#8217; of class to explain dinosaur evolution"},"content":{"rendered":"<p><html amp=\"\" lang=\"en\"><head><meta charSet=\"utf-8\"\/><meta name=\"viewport\" content=\"width=device-width,minimum-scale=1,initial-scale=1\"\/><script async=\"\" src=\"https:\/\/cdn.ampproject.org\/v0.js\"><\/script><script async=\"\" src=\"https:\/\/cdn.ampproject.org\/v0\/amp-story-1.0.js\" custom-element=\"amp-story\"><\/script><link 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  padding: 6px 12px;\n                vertical-align: middle;\n                border-radius: 15px;\n                background: rgba(11, 11, 11, 0.6);\n                color: rgba(255, 255, 255, 1);\n                font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Oxygen-Sans, Ubuntu, Cantarell, \"Helvetica Neue\", sans-serif;;\n                font-size: calc(4 * var(--story-page-vw));\n                line-height: 1.4;\n                word-break: break-word;\n                word-wrap: break-word;\n                overflow-wrap: break-word;\n              }\n              <\/style>\n<p><meta name=\"web-stories-replace-head-start\"\/><title>Going to the &#x27;femoral head&#x27; of class to explain dinosaur evolution<\/title><link rel=\"canonical\" href=\"https:\/\/themasterchemistry.com\/web-stories\/going-to-the-femoral-head-of-class-to-explain-dinosaur-evolution\/\"\/><meta name=\"web-stories-replace-head-end\"\/><\/head><body><amp-story standalone=\"\" publisher=\"Master Chemistry\" publisher-logo-src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2021\/05\/favicon.png\" title=\"Going to the &#x27;femoral head&#x27; of class to explain dinosaur evolution\" poster-portrait-src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/cropped-serafima-lazarenko-I_SY61Ou9r8-unsplash-640x853.jpg\" background-audio=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/Acoustic.mp3\"><amp-story-page id=\"0b2ff5e9-0446-48c0-be8c-61adf75ba2fc\" auto-advance-after=\"20s\"><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#5d6d3c\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-58a12fd5-512d-40be-b2b6-9794f0b48845\">\n<div style=\"position:absolute;width:237.03704%;height:100%;left:-68.51852%;top:0%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-246.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-246.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-246-300x225.png 300w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-246-150x113.png 150w\" sizes=\"(min-width: 1024px) 106vh, 236vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<div class=\"element-overlay-area\" style=\"background-color:rgba(0,0,0,0.5)\"><\/div>\n<\/div>\n<\/div>\n<div class=\"page-background-overlay-area\" style=\"background-color:rgba(0,0,0,0.5)\"><\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:13.59223%;top:20.38835%;width:73.05825%;height:60.19417%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6644518272425249% 0.6644518272425249% 0.6644518272425249% 0.6644518272425249% \/ 0.5376344086021506% 0.5376344086021506% 0.5376344086021506% 0.5376344086021506%\" id=\"el-c04f0f19-5aee-4844-8ad7-4823ce096af1\">\n<h1 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:2.619361243770764% 0;font-family:&quot;Anton&quot;,sans-serif;font-size:0.809061em;line-height:1.19;text-align:left;padding:0;color:#000000\"><span><span style=\"color: #fff\">Going to the &#8216;femoral head&#8217; of class to explain dinosaur evolution<\/span><\/span><\/h1>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"e1778daf-fb07-421d-aeb5-0242765e0ded\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-e52d2a45-9ad9-44d2-b1e5-f3b6db1670be\",\"keyframes\":[{\"offset\":0,\"transform\":\"translate3d(0, -201.03361%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.29,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.45,\"transform\":\"translate3d(0, -56.530651132%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.61,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.71,\"transform\":\"translate3d(0, -19.218813116000003%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.8,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.85,\"transform\":\"translate3d(0, -7.217106599000001%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.92,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.96,\"transform\":\"translate3d(0, -3.136124316%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":1,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"}],\"delay\":0,\"duration\":1600,\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-06d82b82-23d3-4aef-9361-713c19dd6035\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-41c0202a-b78d-467b-a80d-daeba1687dec\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.56311%;top:4.04531%;width:73.78641%;height:34.78964%;opacity:1\">\n<div id=\"anim-e52d2a45-9ad9-44d2-b1e5-f3b6db1670be\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(0, -201.03361%, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.9302325581395349% 0.9302325581395349% 0.9302325581395349% 0.9302325581395349%\" id=\"el-1d7bd897-ce33-4054-aa8d-4ac7a833705d\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13877467105263158% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>Without the changes to their upper thigh bones, birds and dinosaurs wouldn&#8217;t have been able to walk or run on their own.<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:15.04854%;top:49.51456%;width:72.3301%;height:43.20388%;opacity:1\">\n<div id=\"anim-06d82b82-23d3-4aef-9361-713c19dd6035\" 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auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-bd88e5ab-a20b-47ad-b294-a1011b4aaecd\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-13cb04af-58b1-45a7-8928-e9f60df071a3\",\"keyframes\":{\"transform\":[\"translate3d(-117.76316%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-dd76c499-c6e8-4304-9d58-43917c9df937\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 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style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:12.86408%;top:52.75081%;width:73.78641%;height:34.95146%;opacity:1\">\n<div id=\"anim-dd76c499-c6e8-4304-9d58-43917c9df937\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-0844e74e-4cf0-4cb5-9898-b6f621f3d479\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(0px, -277.41768%, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.9259259259259258% 0.9259259259259258% 0.9259259259259258% 0.9259259259259258%\" id=\"el-f878a914-05ed-40a5-ad85-7a78d292ccf1\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13877467105263158% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>New Yale paleontologists found an example of natural selection for increased body height in the oldest known fossils<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:13.1068%;top:2.589%;width:73.78641%;height:35.92233%;opacity:1\">\n<div id=\"anim-bd88e5ab-a20b-47ad-b294-a1011b4aaecd\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div 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style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(0px, 176.75399%, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.5420054200542005% 0.5420054200542005% 0.5420054200542005% 0.5420054200542005%\" id=\"el-ae0115db-50ba-4ce7-a769-0ef8d4b1aac8\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.1295230263157897% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.453074em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>The findings resolve a longstanding question about dinosaur evolution and offer a prime example of how new physical features can appear briefly during embryonic development and give way to older, known features in adults<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:11.8932%;top:66.50485%;width:74.27184%;height:32.8479%;opacity:1\">\n<div id=\"anim-31752c65-1020-4f21-bc63-a6588d7f5601\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-1ee1934f-7119-4e09-a7bb-16144e2f5e5a\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(118.62746%, 0px, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-23b283e5-97de-49d1-82bf-8962535876ba\">\n<div style=\"position:absolute;width:100%;height:100.3921%;left:0%;top:-0.19605%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-249.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-249.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-249-300x200.png 300w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-249-150x100.png 150w\" sizes=\"(min-width: 1024px) 33vh, 74vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"3fa9af2b-391f-4294-91cc-892891d0e7c5\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-d64689c4-25f7-4a38-ab86-e246a96546eb\",\"keyframes\":[{\"transform\":\"scale(1)\",\"offset\":0},{\"transform\":\"scale(1.5)\",\"offset\":0.33},{\"transform\":\"scale(0.95)\",\"offset\":0.66},{\"transform\":\"scale(1)\",\"offset\":1}],\"delay\":0,\"duration\":1450,\"easing\":\"ease-in-out\",\"fill\":\"both\",\"iterations\":1}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-d5063bc6-8d03-4fc8-ba7a-649fc9cd4150\",\"keyframes\":[{\"transform\":\"rotate(-540deg) scale(0.1)\",\"opacity\":0},{\"transform\":\"none\",\"opacity\":1}],\"delay\":0,\"duration\":1000,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\",\"iterations\":1}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-8b90570c-9e62-40d3-963c-21d31238271a\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:13.1068%;top:43.20388%;width:73.78641%;height:54.20712%;opacity:1\">\n<div id=\"anim-d5063bc6-8d03-4fc8-ba7a-649fc9cd4150\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:rotate(-540deg) scale(0.1)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.5970149253731344% 0.5970149253731344% 0.5970149253731344% 0.5970149253731344%\" id=\"el-0ad21179-2e58-40ba-9b89-a3dca338e02c\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.1295230263157897% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.453074em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>This study looked at evolutionary shifts in the femoral head, where the upper femur connects to the hip, across a wide range of dinosaurs, early reptiles, and birds, and their modern-day counterparts<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:12.62136%;top:0;width:74.27184%;height:38.83495%;opacity:1\">\n<div id=\"anim-d64689c4-25f7-4a38-ab86-e246a96546eb\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(1)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-c7e5f580-0a2b-4e82-a9a1-bb5374db4949\">\n<div style=\"position:absolute;width:100%;height:170.085%;left:0%;top:-35.0425%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-250.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-250.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-250-225x300.png 225w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-250-150x200.png 150w\" sizes=\"(min-width: 1024px) 33vh, 74vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"11e144d5-dea0-4974-98cf-6cb706a76ebf\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-f64aa306-3aed-445c-83c9-bf1bb902a790\",\"keyframes\":{\"transform\":[\"translate3d(-119.73685%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-92457e8d-ed68-4a08-9756-500dd53090af\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-69c1dacf-5ac5-4624-a090-89dde1c54dcd\",\"keyframes\":{\"transform\":[\"scale(0.15)\",\"scale(1)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-56762243-a532-4fb3-93ab-ebde39aba8de\",\"keyframes\":{\"transform\":[\"translate3d(118.09210%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-7e9f77cd-74e1-49fc-b9aa-b004c157c343\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-186d5442-4d28-4021-8027-ab0839b407db\",\"keyframes\":{\"transform\":[\"scale(0.15)\",\"scale(1)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-c0cc2bc8-4c5d-4507-a7b3-e0ca955cdd8b\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.56311%;top:2.26537%;width:73.78641%;height:43.52751%;opacity:1\">\n<div id=\"anim-f64aa306-3aed-445c-83c9-bf1bb902a790\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(-119.73685%, 0px, 0)\">\n<div id=\"anim-92457e8d-ed68-4a08-9756-500dd53090af\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-69c1dacf-5ac5-4624-a090-89dde1c54dcd\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(0.15)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.7434944237918215% 0.7434944237918215% 0.7434944237918215% 0.7434944237918215%\" id=\"el-bd5a3382-1e70-429c-991d-7f2455781097\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.1295230263157897% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.453074em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>The way in which the femoral head developed has been figured out by scientists. Bipedal locomotion requires inward-turned femoral heads for fast and effective movement.<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:12.86408%;top:49.67638%;width:73.78641%;height:47.08738%;opacity:1\">\n<div id=\"anim-56762243-a532-4fb3-93ab-ebde39aba8de\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(118.09210%, 0px, 0)\">\n<div id=\"anim-7e9f77cd-74e1-49fc-b9aa-b004c157c343\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-186d5442-4d28-4021-8027-ab0839b407db\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(0.15)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-f58aaa4a-e250-4fd2-8605-c0924c9d0029\">\n<div style=\"position:absolute;width:100%;height:177.38557%;left:0%;top:-38.69278%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-252.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-252.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-252-177x300.png 177w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-252-150x255.png 150w\" sizes=\"(min-width: 1024px) 33vh, 74vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"60024096-4fb2-4f60-9f16-a88625b908f4\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-0af6d089-183d-4d39-bf0c-1ca8c9d13876\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":2000,\"easing\":\"cubic-bezier(.3,0,.55,1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-95608b0d-d108-480b-b4ca-d7999058981d\",\"keyframes\":{\"transform\":[\"scale(0.3333333333333333)\",\"scale(1)\"]},\"delay\":0,\"duration\":2000,\"easing\":\"cubic-bezier(.3,0,.55,1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-3a2a8df6-849b-4eb7-81b8-53c2f0dcd9da\",\"keyframes\":{\"opacity\":[1,1]},\"delay\":0,\"duration\":2000,\"easing\":\"cubic-bezier(.3,0,.55,1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-76deda9c-efbe-4449-8eac-2928e75138ff\",\"keyframes\":{\"transform\":[\"scale(3)\",\"scale(1)\"]},\"delay\":0,\"duration\":2000,\"easing\":\"cubic-bezier(.3,0,.55,1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-80922c63-eb7f-4d28-90c6-04461762f41e\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.56311%;top:7.44337%;width:73.78641%;height:28.9644%;opacity:1\">\n<div id=\"anim-0af6d089-183d-4d39-bf0c-1ca8c9d13876\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-95608b0d-d108-480b-b4ca-d7999058981d\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(0.3333333333333333)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 1.1173184357541899% 1.1173184357541899% 1.1173184357541899% 1.1173184357541899%\" id=\"el-21626201-bc7c-4404-a9fe-3fd57925f5eb\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13877467105263158% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>For years, there had been two conflicting theories about how dinosaur femoral heads developed<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:14.07767%;top:49.51456%;width:71.1165%;height:46.1165%;opacity:1\">\n<div id=\"anim-3a2a8df6-849b-4eb7-81b8-53c2f0dcd9da\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:none\">\n<div id=\"anim-76deda9c-efbe-4449-8eac-2928e75138ff\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(3)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-62b4d258-5084-4162-913e-c978ec358452\">\n<div style=\"position:absolute;width:166.55757%;height:100%;left:-33.27879%;top:0%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-253.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-253.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-253-300x175.png 300w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-253-150x88.png 150w\" sizes=\"(min-width: 1024px) 32vh, 71vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"c5e913ce-91b9-4897-8e34-b1dcea5eafdd\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-87bc07a8-62b9-4ec2-a0f8-b1b568e537da\",\"keyframes\":[{\"transform\":\"rotate(-540deg) scale(0.1)\",\"opacity\":0},{\"transform\":\"none\",\"opacity\":1}],\"delay\":0,\"duration\":1000,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\",\"iterations\":1}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-2026e13f-5ca8-4314-8f2e-11c26fadf072\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-3a3a15ba-95e7-443f-ad7a-710865e0f7b2\",\"keyframes\":{\"transform\":[\"translate3d(116.11842%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-16f7566b-414c-4d51-abf3-3755dba8cf29\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.32039%;top:43.3657%;width:73.78641%;height:52.42718%;opacity:1\">\n<div id=\"anim-2026e13f-5ca8-4314-8f2e-11c26fadf072\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-3a3a15ba-95e7-443f-ad7a-710865e0f7b2\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(116.11842%, 0px, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.6172839506172839% 0.6172839506172839% 0.6172839506172839% 0.6172839506172839%\" id=\"el-ba9f6266-5fd2-4d94-ad8f-ec878a9b044c\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13877467105263158% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>One theory held that the femoral head simply grew an attachment, or overhang<br \/>\nThe other theory was that the femoral head twisted inward over time<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:14.32039%;top:2.589%;width:70.63107%;height:37.54045%;opacity:1\">\n<div id=\"anim-87bc07a8-62b9-4ec2-a0f8-b1b568e537da\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:rotate(-540deg) scale(0.1)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-3308f944-c68d-4990-903b-c66e92d0d97c\">\n<div style=\"position:absolute;width:100%;height:213.48364%;left:0%;top:-56.74182%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-254.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-254.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-254-176x300.png 176w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-254-150x255.png 150w\" sizes=\"(min-width: 1024px) 32vh, 71vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"396deeea-f20a-4872-bf81-6b026bed13a3\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-e4ce85dc-78fd-4b9d-b426-978b83ae8c93\",\"keyframes\":{\"transform\":[\"translate3d(-115.60509%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-2c8acb5a-edb6-460b-8700-0f6a5322632d\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-5eb5851d-6793-4d45-b841-80611ed179a4\",\"keyframes\":{\"transform\":[\"scale(0.15)\",\"scale(1)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-389224d0-d161-4ff2-bf3b-b30bb8fa6f8b\",\"keyframes\":{\"transform\":[\"translate3d(-119.73685%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":1000,\"easing\":\"cubic-bezier(.2, 0, .8, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-a77675f0-181e-4d30-8667-b5f78d592b67\",\"keyframes\":{\"transform\":[\"rotateZ(-180deg)\",\"rotateZ(0deg)\"]},\"delay\":0,\"duration\":1000,\"easing\":\"cubic-bezier(.2, 0, .5, 1)\",\"fill\":\"forwards\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-005e74a4-f5ac-40b8-983b-89479115844f\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.56311%;top:49.67638%;width:73.78641%;height:40.45307%;opacity:1\">\n<div id=\"anim-389224d0-d161-4ff2-bf3b-b30bb8fa6f8b\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(-119.73685%, 0px, 0)\">\n<div id=\"anim-a77675f0-181e-4d30-8667-b5f78d592b67\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:rotateZ(-180deg)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.8% 0.8% 0.8% 0.8%\" id=\"el-11fb9deb-df52-498c-8fd4-c88e6c17cf97\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13877467105263158% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>There is evidence for both the in-growth theory and the twisting theory, which were found in early dinosaurs and crocodiles<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:11.8932%;top:0;width:76.21359%;height:38.83495%;opacity:1\">\n<div id=\"anim-e4ce85dc-78fd-4b9d-b426-978b83ae8c93\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(-115.60509%, 0px, 0)\">\n<div id=\"anim-2c8acb5a-edb6-460b-8700-0f6a5322632d\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-5eb5851d-6793-4d45-b841-80611ed179a4\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(0.15)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-76aa6431-6ed4-41f7-83bb-e9ea803f195b\">\n<div style=\"position:absolute;width:114.76445%;height:100%;left:-7.38222%;top:0%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-255.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-255.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-255-300x200.png 300w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-255-150x100.png 150w\" sizes=\"(min-width: 1024px) 34vh, 76vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"a7c37678-35cc-4fd0-91c5-34c69a9b7f08\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-83ec5903-2901-40cc-a3ae-7261a58e2904\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.4, 0.4, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-b5ef378a-963d-46ec-8ded-80bd20d8a9c0\",\"keyframes\":{\"opacity\":[0,1]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-660aad35-995d-4eb3-a95d-e119c482ce82\",\"keyframes\":{\"transform\":[\"translate3d(-118.60465%, 0px, 0)\",\"translate3d(0px, 0px, 0)\"]},\"delay\":0,\"duration\":600,\"easing\":\"cubic-bezier(0.2, 0.6, 0.0, 1)\",\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-69347313-ff39-4fa8-bbb1-53fc407a0944\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:11.16505%;top:2.75081%;width:73.78641%;height:54.20712%;opacity:1\">\n<div id=\"anim-83ec5903-2901-40cc-a3ae-7261a58e2904\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6578947368421052% 0.6578947368421052% 0.6578947368421052% 0.6578947368421052% \/ 0.5970149253731344% 0.5970149253731344% 0.5970149253731344% 0.5970149253731344%\" id=\"el-2d1acc90-bcb7-45ee-b9d6-64202858e76a\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.1295230263157897% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.453074em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>The researchers used 3D images to study the development of the femoral head in fossils and animal embryos. The researchers studied femoral head development in a variety of fossils and animal embryos<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:13.59223%;top:59.06149%;width:73.05825%;height:40.61489%;opacity:1\">\n<div id=\"anim-b5ef378a-963d-46ec-8ded-80bd20d8a9c0\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:none\">\n<div id=\"anim-660aad35-995d-4eb3-a95d-e119c482ce82\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(-118.60465%, 0px, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-f31a434d-c514-47e2-8489-ede67ed89d1d\">\n<div style=\"position:absolute;width:100%;height:119.92031%;left:0%;top:-9.96015%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-256.png\" alt=\"image\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-256.png 500w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-256-300x300.png 300w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-256-150x150.png 150w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/image-256-96x96.png 96w\" sizes=\"(min-width: 1024px) 33vh, 73vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><amp-story-page id=\"bcf015b6-ddde-449c-a9d5-42b556aa8e66\" auto-advance-after=\"20s\"><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-6012f7e7-b2ed-4bed-99ff-f91c1a2d2965\",\"keyframes\":[{\"transform\":\"scale(1)\",\"offset\":0},{\"transform\":\"scale(1.5)\",\"offset\":0.33},{\"transform\":\"scale(0.95)\",\"offset\":0.66},{\"transform\":\"scale(1)\",\"offset\":1}],\"delay\":0,\"duration\":1450,\"easing\":\"ease-in-out\",\"fill\":\"both\",\"iterations\":1}]<\/script><\/amp-story-animation><amp-story-animation layout=\"nodisplay\" trigger=\"visibility\"><script type=\"application\/json\">[{\"selector\":\"#anim-a236b256-2a37-4316-878b-87f2fdc9bb0b\",\"keyframes\":[{\"offset\":0,\"transform\":\"translate3d(0, -245.10846%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.29,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.45,\"transform\":\"translate3d(0, -68.92449895200001%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.61,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.71,\"transform\":\"translate3d(0, -23.432368776%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.8,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.85,\"transform\":\"translate3d(0, -8.799393714%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":0.92,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"},{\"offset\":0.96,\"transform\":\"translate3d(0, -3.823691976%, 0)\",\"easing\":\"cubic-bezier(.5, 0, 1, 1)\"},{\"offset\":1,\"transform\":\"translate3d(0, 0%, 0)\",\"easing\":\"cubic-bezier(0, 0, .5, 1)\"}],\"delay\":0,\"duration\":1600,\"fill\":\"both\"}]<\/script><\/amp-story-animation><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\" style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-9d0ce155-ad71-4b57-83d9-630e682fbd85\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:14.32039%;top:49.67638%;width:74.27184%;height:40.61489%;opacity:1\">\n<div id=\"anim-a236b256-2a37-4316-878b-87f2fdc9bb0b\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(0, -245.10846%, 0)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6535947712418301% 0.6535947712418301% 0.6535947712418301% 0.6535947712418301% \/ 0.796812749003984% 0.796812749003984% 0.796812749003984% 0.796812749003984%\" id=\"el-3a27fbd6-ff46-4b13-ba06-a227a52fc201\">\n<h2 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.13786764705882354% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.485437em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>Even though the feature remained constant in adults for quite some time, the development of this major feature completely changed<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:14.32039%;top:2.589%;width:69.90291%;height:36.73139%;opacity:1\">\n<div id=\"anim-6012f7e7-b2ed-4bed-99ff-f91c1a2d2965\" class=\"animation-wrapper\" 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style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-9c0f2f32-2c2f-4f05-bae0-861b993fed6f\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:11.40777%;top:2.589%;width:74.27184%;height:54.20712%;opacity:1\">\n<div id=\"anim-c1cd36b1-c576-418b-93fe-27437d56d3df\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:translate3d(-115.35948%, 0px, 0)\">\n<div id=\"anim-d68c1cb7-dcac-45d0-89be-4fe8578eb9ee\" 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style=\"background-color:#fff\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:0;top:-9.25926%;width:100%;height:118.51852%;opacity:1\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-72f694f4-2f6c-4147-a9dc-54fbd71d5365\">\n<div class=\"fill\" style=\"will-change:transform\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><amp-story-grid-layer template=\"vertical\" aspect-ratio=\"412:618\" class=\"grid-layer\"><\/p>\n<div class=\"page-fullbleed-area\">\n<div class=\"page-safe-area\">\n<div style=\"position:absolute;pointer-events:none;left:13.83495%;top:5.17799%;width:74.27184%;height:19.25566%;opacity:1\">\n<div id=\"anim-56bc223b-2e77-467f-ba31-8739196861f9\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:1;--initial-transform:scale(1)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0;border-radius:0.6535947712418301% 0.6535947712418301% 0.6535947712418301% 0.6535947712418301% \/ 1.680672268907563% 1.680672268907563% 1.680672268907563% 1.680672268907563%\" id=\"el-63168ca3-4e60-4946-bc6c-b4bd90437a2a\">\n<h1 class=\"fill text-wrapper\" style=\"white-space:pre-line;overflow-wrap:break-word;word-break:break-word;margin:-0.2297794117647059% 0;font-family:&quot;Roboto&quot;,sans-serif;font-size:0.809061em;line-height:1.2;text-align:left;padding:0;color:#000000\"><span>Read more webstories<\/span><\/h1>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"position:absolute;pointer-events:none;left:17.71845%;top:38.51133%;width:64.80583%;height:49.19094%;opacity:1\">\n<div id=\"anim-f6700aa0-2fad-41ed-84ef-33d656f361c5\" class=\"animation-wrapper\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0;--initial-opacity:0;--initial-transform:rotate(-540deg) scale(0.1)\">\n<div style=\"pointer-events:initial;width:100%;height:100%;display:block;position:absolute;top:0;left:0;z-index:0\" class=\"mask\" id=\"el-560fe132-98da-4a75-acf8-fbd761ef0423\"><a href=\"https:\/\/themasterchemistry.com\/web-stories\/\" data-tooltip-icon=\"https:\/\/w9p347.p3cdn1.secureserver.net\/wp-content\/uploads\/2021\/05\/cropped-favicon-180x180.png\" data-tooltip-text=\"Stories Archive - Master Chemistry\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"width:100%;height:100%;display:block;position:absolute;top:0;left:0\"><\/p>\n<div style=\"position:absolute;width:171.0976%;height:100%;left:-35.5488%;top:0%\" data-leaf-element=\"true\"><amp-img layout=\"fill\" src=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/images-removebg-preview-3.png\" alt=\"images-removebg-preview\" srcSet=\"https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/images-removebg-preview-3.png 275w,https:\/\/themasterchemistry.com\/wp-content\/uploads\/2022\/11\/images-removebg-preview-3-150x100.png 150w\" sizes=\"(min-width: 1024px) 29vh, 65vw\" disable-inline-width=\"true\"><\/amp-img><\/div>\n<p><\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><\/amp-story-grid-layer><\/amp-story-page><\/amp-story><\/body><\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Without the changes to their upper thigh bones, birds and dinosaurs wouldn&#8217;t have been able to walk or run on their 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