Wheredidwecomefro人生就是一列开往坟墓的列车，路途上会有很多站，很难有人自始至终陪你走完，当陪着你的人要下车时，即使不舍也要心存感激，然后挥手道别。《千与千寻》?Whatmakesushuman?Anexplosionofrecentdiscoveriesshedslightonthesequestions,andNOVA'scomprehensive,three-partspecial,"BecomingHuman,"examineswhatthelatestscientificresearchrevealsaboutourhominidrelatives. Part1,"FirstSteps,"examinesthefactorsthatcausedustosplitfromtheothergreatapes.Theprogramexploresthefossilof"Selam,"alsoknownas"Lucy'sChild."PaleoanthropologistZerayAlemsegedspentfiveyearscarefullyexcavatingthesandstone-embeddedfossil.NOVA'scamerasaretheretocapturetheunveilingoftheface,spine,andshoulderbladesofthis3.3million-year-oldfossilchild.AndNOVAtakesviewers"insidetheskull"toshowhowourancestors'brainshadbeguntochangefromthoseoftheapes. Whydidleapsinhumanevolutiontakeplace?"FirstSteps"exploresaprovocative"bigidea"thatsharpswingsofclimatewereakeyfactor.