"Scary" homework problem is impossibly hard
12:41
7 puzzles with surprising solutions
20:19
Amadores acabaram de resolver um problema de matemática de 30 anos
12:40
3 outside the box problems from China
25:05
Ranking Paradoxes, From Least to Most Paradoxical
9:21
Be careful with this nested square root equation
33:06
Something Strange Happens When You Keep Squaring
13:46
Can you solve Microsoft's bridge and torch riddle?
17:13