Why this puzzle is impossible
32:17
The almost impossible chessboard puzzle
32:40
Why does this balloon have -1 holes?
29:42
Five puzzles for thinking outside the box
18:18
Hilbert's Curve: Is infinite math useful?
21:33
I changed this light by observing it
36:34
This puzzle took me three years and required thinking in 3721 dimensions
22:38
Como pegar um traidor usando matemática
22:09