00:00 - Intro
00:42 - Danger of genetic research
1:49 - What is DNA?
3:01 - DNA or environment?
3:30 - Separated twins study
6:27 - How to divide nature and nurture?
8:25 - Heritability of weight
9:04 - Heritability of divorces
12:00 - Influence of environment
13:44 - The big problem for geneticists
14:38 - Heritability of cognitive abilities
17:40 - How DNA influence changes with age?
20:35 - Why siblings are so different?