17:41

topology can make distance weird...

26:43

can you do the hardest problem from the European Mathematical Cup??

11:51

Find all real candidates for x

8:00

There’s a Third Type of Particle and We Never Knew

12:56

L'intégrale la plus satisfaisante – 3 voies

16:04

I solved this two ways -- which do you prefer??

21:05

Why is there no equation for the perimeter of an ellipse‽

19:57

the most outlandish technique is used to solve this...