Many people will admit that they made a mistake [putting money in dot-coms or telecoms at their peak] But that doesn’t mean that they’ve changed their mind about anything in particular. It doesn’t mean that they are now able to avoid that mistake.

Courage is willingness to take the risk once you know the odds. Optimistic overconfidence means you are taking the risk because you don't know the odds. It's a big difference.

If people do not know what is going to make them better off or give them pleasure, then the idea that you can trust people to do what will give them pleasure becomes questionable.

One study found that people who just thought about watching their favorite movie actually raised their endorphin levels by 27 percent.

Survival prospects are poor for an animal that is not suspicious of novelty.

People should be conscious of the large contribution made by anything that gets people together easily in the reduction of loneliness and emotional well-being.

you know you have made a theoretical advance when you can no longer reconstruct why you failed for so long to see the obvious.