Why slicing a cone gives an ellipse (beautiful proof)
29:42
Why 4d geometry makes me sad
19:37
Why this puzzle is impossible
21:05
Why is there no equation for the perimeter of an ellipse‽
18:49
How to lie using visual proofs
27:26
This open problem taught me what topology is
29:24
But why would light "slow down"? | Visualizing Feynman's lecture on the refractive index
10:43
Bertrand's Paradox (with 3blue1brown) - Numberphile
19:27