Three Gears are Possible - Numberphile
16:45
The Clever Way to Count Tanks - Numberphile
5:14
These Gears Really Work?
12:52
Why Machines That Bend Are Better
4:33
Wintergatan - Marble Machine (music instrument using 2000 marbles)
21:12
The Infinite Pattern That Never Repeats
22:59
La paradoja de la cúpula: una laguna en las leyes de Newton
13:01
The Change from Roman Numerals - Numberphile
7:16