When Olympic Athletes Act Out

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When Olympic Athletes Act Out: Photos         Voula Papachristou isn't the first Olympic competitor to let her conduct get in the way of her legacy as an athlete. Read More WATCH VIDEO: Summer Heat Dangerous For Athletes All athletes, especially football players, should recognize the signs of dehydration during summertime practice. Mass Killers Often Show Warning Signs in Youth         The best predictor of adult violence is violence or aggression as a young person, say experts. What are the signs? Read More WATCH VIDEO: Sharks Hunt Like Serial Killers Great white sharks may hunt for food, but the predators use tactics often seen among human serial killers. Tech Team's Favorite Gadgets         Take a look at the list of the gadgets the Discovery News tech team uses on a regular basis. You might be surprised! Read More WATCH VIDEO: iPhone In Space Explained Why did a Brooklyn man send his iPhone soaring towards outer space? Discovery News' James Williams finds out. Shark Teeth Have Built-In Toothpaste         The dense, flat, crushing teeth of sharks contain fluoride keeping their impressive mouths free of cavities and other problems. Read More WATCH VIDEO: Sand Tiger Sharks Deceive with Toothy Look Don't let the rows of ragged teeth fool you; Sand Tiger Sharks are actually pretty shy. Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! Follow us @Discovery_News. At Discovery we value your privacy. If you would like to be removed from Discovery News emails like this, please click here to our subscription center, where you can manage your account. We recently updated our privacy policy. This policy is effective as of 10/30/07. To see new policy click here . Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © 2010 Discovery Communications, LLC