19:16
Doing Math at the Speed of Light | Nader Engheta | TEDxPenn
18:00
"Spooky" physics | Leo Kouwenhoven | TEDxDelft
15:49
There's a global sand crisis and no one is talking about it | Vince Beiser | TEDxPenn
15:36
Quantum Physics for 7 Year Olds | Dominic Walliman | TEDxEastVan
16:34