The Unusual Earth Orbit Circling Above Our Ancient Past | Roger G. Gilbertson | TEDxColoradoSprings
23:45
Fermi's Paradox and the Psychology of Galactic Empires | Matthew O´Dowd | TEDxTUWien
16:10
Is there consciousness beyond the brain? | Philip Goff | TEDxNewEngland
14:59
I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh
17:42
A Theory You've Never Heard Of | Michael Robinson | TEDxUniversityofHartford
21:22