13:19

What is the radius of 🔴 ?

14:29

Find the missing radius!

30:20

can you pass a real college Differential Equations test??

12:11

Simple Explanation of the Birthday Paradox

27:26

This open problem taught me what topology is

15:44

Half of a deathly area...

32:18

PERFECT CHESS BY MAGNUS CARLSEN!!!!

21:43

I Spent 100 Hours Inside The Pyramids!