1:30:00

7:20
William Bialek gesturing
1:20:47

3:20

4:46

3:31

1:04:02

7:19

5:10
three mature students attending a class
2:49

1:14:52

3:48

1:00:24

1:33:42

6:53

2:50

2:14

26:50

2:29

3:27

1:38:01

2:29

25:07

1:04:34