Ham Sandwich Problem - Numberphile
8:06
Tunnelling through a Mountain - Numberphile
27:31
Measure the Earth’s Radius! (with this one complicated trick)
18:27
How to mathematically hang a picture (badly).
17:13
A Magic Square Breakthrough - Numberphile
9:03
Weber's Law - Numberphile
24:52
What if all the world's biggest problems have the same solution?
7:33
Equally sharing a cake between three people - Numberphile
8:41