When 17 year old found a mistake on the PSAT exam

3:23
Le Problème de Géométrie Maléfique

12:46
6 Impossible Puzzles With Surprising Solutions

5:28
Best Budget Graphing Calculator For High School & College Students.

10:17
What Positive Number Doubles When The Last Digit Moves To The First Digit? Riddle For "Geniuses"

19:27
How Paul Erdős Cracked This Geometry Problem | The Anning-Erdős Theorem

22:56
Visualizing 4D Pt.1

13:37
How To Solve The Hiding Cat Puzzle - Microsoft Interview Riddle

20:50