Colouring Knots (extra) - Numberphile
Why is there no equation for the perimeter of an ellipse‽
The hardest "What comes next?" (Euler's pentagonal formula)
Why Sugar Always Twists Light To The Right - Optical Rotation
Does "land area" assume a country is perfectly flat?
The Infinite Pattern That Never Repeats
Why Gravity is NOT a Force
How did Ramanujan solve the STRAND puzzle?
General Relativity: Top 05 Mishaps [inc INTERSTELLAR]
A Miraculous Proof (Ptolemy's Theorem) - Numberphile
The Useless Number - Numberphile
Poncelet's Porism - Numberphile