but in her classes, cuddy noticed that power seemed to have a physical connection as much as a mentalwith power and dominance, across the animal kingdom. so they're sitting in ways that i can't sit right now. so they're sitting with their knees apart, and you know, an arm draped over the seat next to them. >> reporter: most of the women were exactly the opposite. knees close together, assuming low power positions. >> they're contracting. they're making themselves as small as they can. they don't want to bump into the person next to them. >> i laugh because i know because that's how i often find myself sitting. i think a lot of women can relate to that. with dana carney of the university of berkeley at california, cuddy set out to discover if power could come from a pose. >> we wanted to know if the body could shape your mind. >> reporter: hormones are chemical messengers that signal how body and mind should react to a variety of stimuli. in powerful people the hormones testosterone drives confidence and assertiveness. in stressed-out individuals, cortisol is the hormone that spikes. c

we turn to john cuddy for the story. >> amidst family and friends under the protection of private security10 acre property. they learned robert kennedy junior the nephew of john f. kennedy and son of bobby kennedy was at the residents and was the one who called police after a housekeeper found his wife's body. she noticed she was missing around 11:00 a.m. after finding her purse but no sign of her. worried the housekeeper called robert who lives nearby in bedford. he called a local aa group to find out if mary was there. a search followed. bedrooms and carriage house was checked before a housekeeper went into the barn. she set animal traps on top of one another and kicked them out from under them herself. she died from asphyxiation due to hanging. the news coverage surrounding her death she issued the following statement we loved mary and knew her to be an exceptional mother, sibling and friend to many. countless people described her as an extraordinary mother selfless in her desire to help others. >>> sad story. >> the time right now 16 after the hour. coming up, move over paul mccartney.