More recently, discussions of extraterrestrial life have become mainstream. Brilliant minds like Stephen Hawking and Neil deGrasse Tyson have made headlines with their thoughts on how humans should or shouldn't make contact. This week, I invited my friend and colleague Loren Grush to explain how science thinks about alien life. It's a bit spooky, like a Halloween-ish episode, airing just a few days late for the horror holiday.

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