A lot of people ask StarTalk Radio host Neil deGrasse Tyson if extraterrestrial life exists and why haven't we encountered any alien life yet.

"Maybe they have visited us in Times Square," Tyson tells us. "But no one noticed because everybody who hangs out in Times Square is just a little crazy."

A more serious concern, though, is that maybe humans are so stupid and uncivilized that aliens have decided we're not worth encountering.

Neil deGrasse Tyson talks about aliens and why it actually might be a good thing that aliens haven't visited Earth yet.

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