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Even the smallest dose of power can change a person. You've probably seen it. Someone gets a promotion or a bit of fame and then, suddenly, they're a little less friendly to the people beneath them. Why? But if you ask Sukhvinder Obhi, a neuroscientist at Wilfrid Laurier University in Ontario, Canada, he might give you another explanation: Power fundamentally changes how the brain operates. Everybody watched a simple video. In it, an anonymous hand squeezes a rubber ball a handful of times. Obhi's team tracked the participants' brains, looking at a special region called the mirror system. The mirror system contains neurons that become active both when you squeeze a rubber ball and when you watch someone else.... Whether you do it or someone else does, your mirror system activates. In this small way, the mirror system places you inside a stranger's head. It turns out, feeling powerless boosted the mirror system - people empathized highly. But, Obhi says, "when people were feeling powerful, the signal wasn't very high at all."

Palin is undermined by questions about her qualifications

Esquire's interview with Governor Tim Pawlenty, whom many expect to run for president in 2012, on bailouts, health care, whether Obama is a socialist, and where Republicans go from here