i want to see some more of it, though. >> for iris white, the playwright, it was the first time he hadhis life. >> but white's elation was not to last. the day ended in bitter disappointment. >> and then an hour later, he got in a fight in the yard and got busted and got sent back to the shu. so it just shows how fast things can fall apart even when things are going good. prison can take it all away from you. >> it's the old law, you know? for every action, there's a reaction. so i can relate to macbeth, you know, by the choices he made predicted his punishment. some of us made mistakes. our choices was mistakes, now we're paying for them. >>> next -- . very dangerous individual. a very dangerous individual. his beliefs which aren't the norm of any known society that i know of. >> a feared inmate is released to the yard. four walls and a roof is a structure. what's inside is a home. home protector plus from liberty mutual insurance where the cost to both repair your house and replace what's inside are covered. so your life can settle right back into place. to learn more, visit libertym

. >> reporter: named after the goddess iris, researchers say the hormone has a powerful effect on white. that's the fat that gets stored as calories. according to the researchers, when the hormone is injected into mice, it turns on genes that would change the white fat into brown fat. that's the kind of fat that burns more calories. it's what our bodies do naturally when we work out. >> animals exercise, and the muscle releases this hormone. and it tells the fat to burn more calories. >> is it time to toss out the gym membership and head for the barcalounger? it won't make muscles stronger. and it won't be tested on humans for a couple of years. doctors don't know what the side-effects will be. and dr. williams stresses, it's not easy to turn research into reality. >> it's difficult to translate scientific discoveries, even actual ones. >> but if getting fit and dropping some pounds is your goal, here is what the doctor says are two sure fire ways to get started. >> one is, get rid of sugary beverages. get rid of sugary soft drinks. and the second thing is, walk. if you can, walk. >> go