"I have always emphasized the willingness to discard," says psychologist and Nobel Laureate Daniel Kahneman, professor emeritus at Princeton University. That philosophy works on two levels -- forget desk trinkets, Kahneman doesn't have a desk -- and he doesn't hoard ideas either, he says. If an idea doesn't work, he lets it go. Kahneman, who won the Nobel Prize
in economic sciences for his research with Amos Tversky on how people make decisions, is retired and works from his New York City apartment.