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also carolers hit the halls for fox news for a festive sing along. i love that. plus, back by popular demand is our naughty and nice list and a brand new segment we're revealing favorite childhood christmas stocking stuffers and annual secret santa gift exchange that will blow your mind. don't miss it. but first, time for a christmas edition of the fastest. first up, holiday get togethers are a prime location for asking embarrassing questions. a new survey says one in three people dread awkward conversations at family gatherings like have you put on weight? have you found a partner y...

repeated blows to the head, the kind that you get on a football field can have lasting reprecussions. especially for young people. some states are writing new laws. in fact, one just took effect this month here in california. any player on a high school or middle school team who gets a concussion must be cleared by a trainer or doctor before going back on the field. even then, though, the risk is hard to gauge. you can't really see damage to the brain unless you actually look inside. of course, by then it's too late. >> reporter: football is a violent game, full of big hits. what are...

at for more than a year now. growing evidence repeated blows to the head, the kind you get on the football field can have lasting rep recushions. a law take effect in california. a player who gets a concussion must be cleared by a trainer or doctor before going back on the field. the risk is hard to gauge. you can't see damage to the brain unless you actually look inside. of course by then, it's too late. football is a violent game, full of big hits. what are all those collisions doing to the brain inside the helmets? i met with kevin, he's a researcher from the university of north c...