CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "www.sciencemag.org",cType: 'managed',cRay: '8e7813a09aaece69',cH: 'Qfvpyeec4AmTr.PZWSmSJ3wehH7VwrEhSgMNi53__wM-1732437442-1.2.1.1-fGizvw4LYk2IzeZ.3y3R7x8OfGiacun0aLQl5zgDpS.SSUW3XjhSDGOJ6w6jiIFX',cUPMDTk: "\/news\/2016\/08\/did-famed-human-ancestor-lucy-fall-her-death?__cf_chl_tk=QSHZf1A0sQPVhIt1S4_MGfoCzqiB.4SBhE70JeBjklo-1732437442-1.0.1.1-t0LnGq88c8ne8LmhuviKMOoUcDOyjGL5v5s1syghn5U",cFPWv: 'g',cITimeS: '1732437442',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/news\/2016\/08\/did-famed-human-ancestor-lucy-fall-her-death?__cf_chl_f_tk=QSHZf1A0sQPVhIt1S4_MGfoCzqiB.4SBhE70JeBjklo-1732437442-1.0.1.1-t0LnGq88c8ne8LmhuviKMOoUcDOyjGL5v5s1syghn5U",md: "0UoL3qC_Ti.sHf803PnJgf54H5WKC2kWvBrtOzhG8ew-1732437442-1.2.1.1-DhvizucftmrZQCCtasBAn_0t0LPSU6pOM83bY8sPRmmsVHPov4nL0lQOc_ObP9L_B74r2ye2U.UNg0DN737JDhWkKD9hIyeYfWvFkeZSnxp5JFCwwPDfWpEr6CQ.RT1dGeWO2XMemfywPWrCnldzp841_B_ua.Xob4dPltKJBYP9rEx28Q1svYjPT.fHBrTGI3ArLnpY_6owDnBh4cP7Qmga5e8oLP88iLbH0HSbkq9QgsT0E6TmzJLCp_S2TxEtwcZp.lJVnhKP1_5Tr1Zv42js3StJ2UQUBf.saU3PHjZJsWfbWCgpp6p4Ne8Rh4FmV6RA4kXsD236WuJyyTOiLUzvX1WggfRnglr45mV.qaQHC57tpRw5LCo1q0tH3f.zwQowMA.Mk78YpU6dD3qoaUtHHL7w5_yT8Enoo7Y9zbTs_AV1O_ic0moLgkg4SRFE1_cpTjrl2RvcKBEE4Zoh0f6Fcd4JQBKQU7lusjv.p6Ekh84yPkApxuoBRySlvTTIs1ccLRBTC2XWdIkCSsJ5nzmTUOaYQweZivxvF9EXqLbO_xpU1VtOeM1kYPay2v6OJaWep7IFC8gJLZ5GBrDlwowjJxqsgaHWAIjhUADlnUH4gB0oI87lFqLuHhbNw268X2OFetnZtnL_04Uium4II2zh_Ug9lgZrFfmCTpv7y2hH9gbpwbYJUIbAXQQ8TuYsD4bO4sS0so0k9oOCjodwanL_vfW15lth8mRz1K6D.0bM748BPutg_1aSqdeE6PA6jX1mbF2OjKguCUdqUpbHNbP9Z_83rSNHoxPipag0oEVZMhadT8u30gE1HVITSHSSCfiLz.VaMACkO3SeZO8Nsbn.9HpMxm3defkLHQy50cpIuksO1Ltls12vqqfDZMkTS7la31xnP_CDQJkl85db7tCzIF0xBt_apvB2KG_oSfFHGjEE_jVfrnR_iZLKrmIQCxqCC8JNO2Yo7rblYYlkOK9B_EbeBOm3kDuVu7jS2YcO_2qRx5HcLa6.k14SSR8NFlUmvQkVsz9nlzw31T9ihH2rixEMiy9xwTQ87YWzXc8mb6VP5Js1NRf2a1pAHzrW2pejuR4xbSHyztgAC5K1NSodcbDnurOmAvz1yD6j0K4tgpKHc2Wv1iATdjLf1R0ZLUm_r6rkMVBCYp8WPdw9f5Y.G.EuKDgbREQHeBp_vDIiSZIYOJVkxZ0pFKqzJWIJOzKUf5oRltk_.cFv5BWVteepxSC2ijbU_GRKRA.AeVBIfezYF01odXX6QSlkmjs01ZanmFgtl5oi74f9Bj_Ql6bGEtJiNuZiMFGo1ubrs8x4TU_PTMyG3XFGd_KfUtWC5Z8hFlqXlCJJ0iN4gmfkQ5i11g2ywgeBqi1kZ8nIPYm0rjrw8Y4IIgss3TAs83ho.dVlysp2zOmOoJrNFz7Ap9m4rrFF.e0946YgTz1FOKepDCS2QpM96LJ36h3svntkZ2SNsAWqYVml1yNecqweapOsHEr9iuY3TnSUSX_I2r9GXAk09mLb.sb.W0RNa28bbGjPtQVoIGZPN7aHEZYZWX7CSnn22DA07fBI8oSkCxdkydX5K_0iyhlvtjAQiZSCDC1uKGNc5RbEYk_tsieeZlFkKlB1nZR3HTl1kPWX859pCdfHleq1h2vxwN5Kw581rO2XsUXdJd4xLGmymH_hTO_f7IoSIDsYvdEZb5rEQJJhtW9i8ImjPSNVPufsbJkNb8jWkY6PeX1MvZSNxF_TkdPDtmlnEiuNamt.IH8tyBfjptAZFyI0lQG_vF8D3TBYwRYrThjyIAsTo2rwuVTvvnEJ3G7RI1KEt.ac2s3LrWgfq7i_ZZ7.KqM6YANASzOdioxDqkU9K3trhytdLHZRLmpySUKKTyUWkkn4rV_FiM0vpwedMjJ4WqQyx2BSxd9YmVGwYeNbjGabXDu.m1tVUX7VQi.62V4zGL6rwO2BCmysQsR8USYwQpPs2oqGqLX7LKwGJNkgRXXRikOQdH8VERLSxhr0Fkx0upZY1qTcXWfBpVWR7p5bRYHn0erLgRbtMyr8NQxN2HDaXMmXqd6ptu0e_.QjYtBZBV47UtqLJZx.OTLThmq7KYRZSfClPEQ3Se1.Kw.r9Yl8OZwxz1wEdssWmb7io.vEXZ303FAvDHUMo3gsKS0zvyFh9AGvApv82FiM4MeiPrsrc6g8YVAsdB3yRXc9_2FLtc8IkAENXhVjhZOHpKrl664t4vFBqVOIFoY1OCRhPNOBEGIFZRsdc36yNKro8UN0EtRmCsZTzhndZUFb9ZIFPlnULCKI0gjWVTePWKSFZlzQ4eIRW5_nC2gtd2smYllmkc5dLT83HS9m2LVOzwCg6BMF9X1XQijlaT49sfAKKVY.k9V14xqGFGSzp.SFaagJOGV_w2EQVDcTEyhloi1uuHoE1caI25gpmQ5mlb1tS9FyJTYbQyzM7IYyZoKNkbXeQZhZgaFXXvIW8.yNBs2GEbocJsd6YD4ateQU7Gz2bxfGGjnFqr2cpxhERzHFwPxhoAi91hSybaD_u.zTxMRWmRfINXFdxnxpAy4I.gUkiPM2m.h_UKteXuy_4WTCQlm6ClKeEyWN1V0Oao8JGg7ClmVa2NVVTVMibTZwlqKKFrzAOX1XGVyiZNC98uX_z1fSVzTaaJxyTYsds2w66GFZZ8cijawVp8m9W9Rh3Fk32spBZkP9X0ztsHPRzzguDTIxEmXbHq4.pr55APL7ZgKRBpC.q5pDDiT2bGBclZmkgH0b9XZZYc9B1IALBtxhOmYI58HrBLwEhz3Fc7wVCzmJRWZABPu9q55kJ1iwiwls_aQtrVa90TlAdBroaeqdsUk18wQdUxWRl3wtXM.JSCj9QmAl6yBLf5GAyk46Wvany74zOXyjuqXL4.GEjJxMLKIDtHFecJcTjQVt9TMFFztzFIH9osBu_gd29.EvHEvWNIBUkuSA9v9zRN0p8R7vkuj8NzA.ioBY9wCxkJZ8HrlSsGVQinuP.8QzI1MvB1DK8AZzWU0rSOi1.Bz8sonJ5Tu1aak_476.eORkYL6f8fpI2P.iItx0jo8o",mdrd: "1A8CE9t5uTc.uTKShlrNp1Gr3C0ggo33KocsIMvwGtA-1732437442-1.2.1.1-hwruBIJXB9rXDEw8yGe4qgDQICwcXMDiid50cQVrl5JIpFOsnENF5..ia79ZiJHbrqDQdZh63MtOvZ0jYN1rbSX.UfiGbvKY0mEsxc3KYRSKf__ZCJ7kMHYvaFatZkUfdIjxOijkHt8L31ypmsqCBrqADa7lk.uw66HwWC33Teoa_GsAdC404KStO_QZTe6_BnWJ79EqohLuJ8RqsTTdciIy8CkhPqZMxekUagtiFdFlqwoy6KCJPicJ_S88jaRWqFxnHdO2mPcERcx8pEkJP5LP1tHjRnclIwa4mNKsTV0DFKPbRuYCFWPg5IqKmy.8lHtCJsIujhyGv_J0wY1IIt7NDnefjdCwnwx7LCXOzePqSg8hOEAVlUAW8kUY5U4tnUuox9eQCZzNWi2MILnsVbLZjqB8J_jgqlpU7DLUzxSpUIEX6Ypo9WexMS3_b0HBMICIXIp0vsJgGHn4irmKU5PO6B6FmsQRXtU21niRgW9tN54zo2dRtAD3ZzaqaW6F1IVYtEQ7xYGGzCItQB0j7JuS58rykVCWbIZIRyOswnj3nUd71uySExMDZ8cNm9flaFdZ_0LK1CHdHhnpCuznZlCGzK1cTrj7SGLjGxtH7Vzd_lJDoLh4jTBY4eYe2eSnehLOZ_PB7UILayv5CELdiehqiQeOSqgRYRBqbbc_BX7ROeCUpbCDqTdzpTR65FmuYKI94veuXtIynjTAvpUEdVX0h_bs3SRfp3xMeadJOXx91I6Z1pekQp6V17obPT6H2PyHykDN6Ux7aGTqlduqXhDbUbH6dbFtZuUva3Gn7zwTeklCOkgxTM.zfB3uaIqXxhyJj7gWKdGNQGocc85yKGm7K8sb.W6E4bN79M9nCm2GL.4rSgWZCIs_1OnSIPHXeMhN1.HO1LdwdHFgjQqFOekG3WInTt9GEBKoOt1ArCYmgh3lrOvlf5_IcwCD5u0QKlW.Pb.ECUbT_VchjUZtIMlxKPJHYaVgYlgaX00OHy99k70rgTVMOcHV0pxyD3NEfr9saU.ql99LPAQcUzpHKD9nb3QV1ycrxW39BdWWGPR7AKUvMF8hi2vWwy1_51590V0.GZl815UhpjW09RKKHhL6CTlXOVr0Uz.pQ9UeXYmvy0UfHEdgRnmOX85DBIekyJIMOJywdQ5MU6GNK95T6ORnFTmVeU71Vvh.XvMwKw5WK9zN2kSRGGiW3nq6pXEhJqOmlDI8z6OjkPSN6Z38gD4vyZgz4uPsnRTlQ5FS2coKIHF5o0dEE8o4F7LbFG.z1FsqN4zgD4bvhk_U7vOki8t2vAO4SMZ0ArL7aPI3dpM3n7dUiB8rIwGK8lBUzLWlrKl_5dp2fFoWeHlr23Hu8TyOVnUXoayy3.P94_uFtQXlwGou9Br4AfO_H6loAK2MHXpLIu.aCDXGKnYMT6ltADp5Fjax.gEB3RspJr0.G1KCA.ToH3uB3WzqeIk77H6dEH71pkS8KIoU_xDsjLo9Rz6loknAQ_fBIXs2Xf0nrI42rDNrV0Og0ryri_HeWpR3j.x4c_F0vthS7GIF5axWcvrjDa7nhs2PFdvUqbYE1077SstCA9CPWHBKGAo2ZWhtJ8KA0YLfmpHpTE67kqMqth3VEwfsXITof1qjckOHWDmRgmaRuZu47xN9xn71nNKV6VpUFijhjjxlDl_WiewKrCJ_Ld6B0aHfh0Uj4tzdljLBtbLVvh4D9PN9TF1yYiRXP3h.tDjYVfjSLeyOQc2DysNExzddQCG_aY43OK2ur2f1tmXNG_qHMFVuzcrrgk_ayFrAjLGNK6d8SgndRAeRTQwms0SCEIqiaQx3.GKSlNlA4yA6dmusFASuUbNjsYe11yEwKIRCFX54LYvEDUesHHKuyHj5xHsUQrI4qeqAyoE1VPsHEWWMqQFmWQPVsj_X4e.c6PXojWykjq85pPKu4hG2SWGUgm4LHimctrO9ZGt20Vt3PJqiw86Mj3UTU4ct"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=8e7813a09aaece69';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/news\/2016\/08\/did-famed-human-ancestor-lucy-fall-her-death?__cf_chl_rt_tk=QSHZf1A0sQPVhIt1S4_MGfoCzqiB.4SBhE70JeBjklo-1732437442-1.0.1.1-t0LnGq88c8ne8LmhuviKMOoUcDOyjGL5v5s1syghn5U" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>