Math homework has kid in tears and both parents stumped. How to solve it?
12:46
6 Impossible Puzzles With Surprising Solutions
14:02
Is 1/4 of the circle shaded? Most students get this wrong
9:20
Pentominoes and other Polyominoes - Numberphile
22:59
The Dome Paradox: A Loophole in Newton's Laws
10:48
Can you Solve this Lever Engineering Puzzle?
14:36
Word Puzzles In An Alien Language - LOK
14:02
Hedge fund interview question
9:46