17:30
Why We are Alone in the Galaxy | Marc Defant | TEDxUSF
16:10
Is there consciousness beyond the brain? | Philip Goff | TEDxNewEngland
23:45
Fermi's Paradox and the Psychology of Galactic Empires | Matthew O´Dowd | TEDxTUWien
24:02
Is Time Travel, Especially Into the Past Possible? | Matt Szydagis | TEDxSchenectady
22:31