13:56

How gas pumps know when to turn themselves off

9:42

How the portal illusion works

9:12

The Assassin's Teapot Is Weird

23:47

Bed Bugs- What You've Been Told is Totally False

26:51

New divisibility rule! (30,000 of them)

12:05

Wirtz pumps are really clever

17:35

How a quartz watch works - its heart beats 32,768 times a second

19:19

We should use this amazing mechanism that's inside a grasshopper leg