The Centrifuge Problem - Numberphile

The Centrifuge Problem - Numberphile

The Josephus Problem - Numberphile

The Moving Sofa Problem - Numberphile

The Brick Factory Problem - Numberphile

The Goat Problem - Numberphile

Get Off The Earth (a famous & bamboozling problem) - Numberphile

Euclid's Big Problem - Numberphile

The Illumination Problem - Numberphile

The Three Square Geometry Problem - Numberphile

The Light Switch Problem - Numberphile

Tree Gaps and Orchard Problems - Numberphile

Ham Sandwich Problem - Numberphile

Monty Hall Problem (best explanation) - Numberphile

A Colorful Unsolved Problem - Numberphile