Fair rating?Through the Wormhole· Season 4 · Episode 2
When Does Life Begin?
We can all trace our lives back to a beginning. But what defines the beginning? Is it the moment when two cells unite? Or does something have to know it is alive before its life can begin?
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#6In Season 4of 10 rated episodes
#36All-timeof 62 rated episodes
+0.3vs season avgSeason 4 averages 6.3
2013First airedJune 5, 2013
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