The Unusual Earth Orbit Circling Above Our Ancient Past | Roger G. Gilbertson | TEDxColoradoSprings
18:05
Is the house of history built on foundations of sand? | Graham Hancock | TEDxReading
14:59
I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh
16:13
Why do we celebrate incompetent leaders? | Martin Gutmann | TEDxBerlin
17:42
A Theory You've Never Heard Of | Michael Robinson | TEDxUniversityofHartford
17:59
Supermassive black holes: most powerful objects in the universe | Martin Gaskell | TEDxMeritAcademy
18:33
Consciousness -- the final frontier | Dada Gunamuktananda | TEDxNoosa 2014
17:33
Why renewables can’t save the planet | Michael Shellenberger | TEDxDanubia
12:41