Why My Watergun Design Got The CIA's Attention..
15:51
I Built The First LAMINAR FLOW ROCKET ENGINE
17:11
Building a HIGH SPEED Rocket Plane
35:12
Por qué los suizos aman sus armas (más que los estadounidenses)
9:43
The Deadly Coilgun/Railgun Hybrid You've Never Heard Of (Helical Railguns)
15:49
I Turned Cheap Waterguns into DEVASTATING WEAPONS!
18:06
Can You Charge A Phone with Marbles?
13:31
Construí un generador solar de 3,5 kW con espejos de 5 $
15:21