and these are developing groundbreaking treatments for cancer. they're the hands of the nation's top doctors. kaiser permanente doctors. and though they are all different, they work together on a single mission: saving lives. discover how we are advancing medicine at kp.org join us, and thrive. >> dubois: the graham family has run the "washington post" for four generations but that is coming to an end. the paper announced today it's being sold to jeff bezos, the founder of amazon.com. price tag: $250 million. bezos says he understands the "post's" critical role in washington and he promised the paper's values won't change. well, you can't make an omelet without breaking a few eggs, but you can make a hamburger without hurting a cow. in london today, dutch scientists cooked up a hamburger they grew in a laboratory.