5.3 supplement

15:24
Romanian Mathematics Olympiad

14:08
Every SAT Math Desmos Hack in 14 Minutes

13:55
Imaginary numbers aren't imaginary

26:50
All of SAT Math Explained in 26 Minutes

32:50
MIT Entrance Exam from 1869! – Can you solve it?

21:25
How Every Country Got Nuclear Weapons Explained

18:27
Forget Doping, These GENIUS Cheaters Will Blow Your Mind

14:23