Season 4 Episodes10
Cast1

Morgan Freeman
Self - Host
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Ranked #4 of 10 in Season 4•matches the season avg
It is a debate that has raged for centuries’. Groundbreaking evidence reveals that inside all of us are traces of cells from our relatives, blurring the lines between one life and another. Technology is now giving birth to new life forms made of surprising components

Morgan Freeman
Self - Host
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"When Does Life Begin?" is episode 2 of Through the Wormhole season 4. It scored 7.5/10 from 101 votes, ranking #4 of 10 episodes this season (season average 7.5). It aired on June 5, 2013.