2. When you help a stranger, they often say “God bless you.” I generally want to say something similar when a stranger helps me. This is evidence for the hypothesis in the book Sapiens that what made Homo Sapiens develop huge societies is our brains being able to think of a God that unifies us.

1. action in mass is partially explained by credit assignment. Why is it that if someone leaves their bike unlocked then it is more probable for another person to leave their bike unlocked? It is not only that people follow what other people do; in this case, the chance of having their bike stolen decreases if there are more bikes. Also: encouraging other people to do the same thing as you is also explained by this.

0. In many revolutions or wars, they destroy libraries, museums, and art. Does it ever make sense to destroy? Would any correct ideology destroy human knowledge?

-1. Does capitalism work because there is no single person with most of the power? In communist China, Mao replaced most of the people in the power many times to direct China in whatever way he wanted. Stalin did a similar thing in the USSR. Current Singapore seems a counterexample. The problem is that having the power centralized for long terms means that none would stop the presidents from doing wrong and uninformed actions.