Wanted: A Science of UFOs | Alexander Wendt | TEDxColumbus
17:51
UFOs and Aliens – What Science Says | Donald Prothero | TEDxResedaBlvd
16:29
Lessons from My Wife in Finding Alien Life | Douglas Vakoch | TEDxKingstonUponThames
15:01
¿Te imaginas como sería un viaje interestelar? | Ryan Weed | TEDxDanubia
17:30
Why We are Alone in the Galaxy | Marc Defant | TEDxUSF
14:22
Beyond the singularity: The search for extraterrestrial technologies | Andrew Siemion | TEDxBerkeley
14:59
I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh
15:19
Where Are All The Aliens? | Tim O'Brien | TEDxOldham
17:59