23:45

Fermi's Paradox and the Psychology of Galactic Empires | Matthew O´Dowd | TEDxTUWien

17:30

Why We are Alone in the Galaxy | Marc Defant | TEDxUSF

14:59

I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh

16:10

Is there consciousness beyond the brain? | Philip Goff | TEDxNewEngland

13:13

Disappearance of a 50.000 Egyptian Army | Olaf Kaper | TEDxEde