20:10
The Unusual Earth Orbit Circling Above Our Ancient Past | Roger G. Gilbertson | TEDxColoradoSprings
17:59
What if Everything You Know is Wrong: Bob McDonald at TEDxVictoria 2013
17:58
Are we heading towards World War III? | Heni Ozi Cukier | TEDxLisboa
17:05
The Origins and Evolution of Language | Michael Corballis | TEDxAuckland
23:45