25:38

Euler's Disk

17:31

Spinning

7:35

The Topsy Turvy Top

17:57

Gearless Magnet Bike

13:39

Why Your Pee Looks Like A Chain

19:19

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

15:01

The Hui Stick

23:06

Blessures liées au travail du bois au ralenti