June 7, 2011 12:50 pm Are Dirty Girls Healthy Girls? Are allergy rates linked to playtime preferences? New research suggests that girls are less able to build up their immune systems when they don’t play outdoors. US & World Videos 0:45 Lakers fire head coach Darvin Ham 1:12 5 things to know about Tom Thibodeau 21:18 Jim Gaffigan gives hilarious dad advice to Kelly Clarkson audience 9:45 Orlando Bloom says he's shocked he's still alive after filming his new adventure show 9:22 Mississippi nonprofit tackles poverty head-on through radical approach
