1:14:59

By The Sea - Eleni Karaindrou (75 mins) Loop Version

30:13

Kleinunternehmen mit hohen Kosten: Viel Arbeit für wenig Geld | ZDF.reportage

23:43

a very tricky Diophantine equation

21:56

Integrating the impossible

12:35

an amazing approach to this classic integral

15:55

Integration By Trigonometric Substitution

31:10

the geometry of the third derivative

19:14

The strange cousin of the complex numbers -- the dual numbers.