Top 10 Spy Tactics

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Top 10 Spy Tactics         Ten ways spies disguise, conduct surveillance, procure secret information and exchange secure messages. Read More WATCH VIDEO: Top 5 Science Conspiracies, Theories and Hoaxes Five scientific mysteries you may never have heard of. Zepplin Hunts Calif. Meteorite Debris         SETI and NASA have mounted an ambitious airship mission in the hope of retrieving chunks of the Sutters Mill Meteorite. Read More WATCH VIDEO: Is That a Meteorite? Is that rock from Earth, Mars or the Moon? Scientists in Washington, D.C. will tell you for free! Sharks Mistaken for Lake Monsters?         A shark expert suggests that lake monsters in Alaska and Scotland may actually be sharks. Read More WATCH VIDEO: Amazon River Monsters At the Amazonia exhibit at the Smithsonian's National Zoo it's lunchtime for some of the river's aquatic residents. NFL: How Veteran Players Become Victims         The death of former NFL linebacker Junior Seau has raised fresh concerns about NFL guidelines for the treatment of concussions. Read More WATCH VIDEO: Summer Heat Dangerous For Athletes All athletes, especially football players, should recognize the signs of dehydration during summertime practice. From Our Sponsor 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