researchers in the u.s. and sweden tonight are working on a possible blood test now for depression. a new study revealing a molecular deficiency in the blood of patients with major depressive disorder. they do hope the findings will help treat the disease. we have more on our website tonight. and alec trebek, tmz is reporting tonight that trebek may retire when his contract ends in two years. say it isn't so. he says there's a 50/50 chance and a little less that he would stay on. trebek, who is 78, has been hosting since 1984. when we come back tonight, the surprise from neil diamond, they loved it. and you will, too. you're headed down the highway when the guy in front slams on his brakes out of nowhere. you do, too, but not in time. hey, no big deal. you've got a good record and liberty mutual won't hold a grudge by raising your rates over one mistake. you hear that, karen? liberty mutual doesn't hold grudges... how mature of them. for drivers with accident forgiveness