I found this article in Psychology Today to be a really interesting set of conclusions from specific behavioral studies. The ten truths listed are:

1. Men like blond bombshells (and women want to look like them)
2. Humans are naturally polygamous
3. Most women benefit from polygyny, while most men benefit from monogamy
4. Most suicide bombers are Muslim
5. Having sons reduces the likelihood of divorce
6. Beautiful people have more daughters
7. What Bill Gates and Paul McCartney have in common with criminals
8. The midlife crisis is a myth – sort of
9. It’s natural for politicians to risk everything for an affair (but only if they’re male)
10. Men sexually harass women because they are not sexist

If you are pressed for time, read #1, #3 and #4 (they are related), and #8.
If you are really pressed for time, just read #1.