. >> they speculate maybe because everybody's got the same tail weirding out thedog, attacking, and goingrazy. a lot of fun. >> and the greatest sound is the sound of dog call paws on hardwood floors. >>> he's the host of espn "sports science" but now. >> put down all his lab tools and picked up a guitar. ♪ christmas is my favorite time of year ♪ >> hear how he got a bunch of sports stars in on the holiday hit. >> how many phone calls did you have to make? >> and a skier wants to get some air. so. >> he's about to take that jump. >> see why going for it doesn't get him far. [ laughter ] >>> closed captioning provided by -- ow that coffee breaks down tooth enamel. thankfully, she uses act restoring mouthwash. itit r rebebuiuildlds s tooth enamel making yoyourur teeth two times stronger. acact.t. s smimilele strong. babackck p paiain?n? geget t the same kind of therapy wiwiththouout t anan a appppoiointntmementnt. smsmarartrtrelelieief f frfromom i icy hot. a a wawaveve o of f rerelalaxixing pulses ththatat b blolockck e eveven n chronic pain. smsmarartrtrelelieief.f. mymy s skikin'n's s so