Who Killed JFK?: A Conspiracy Primer

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Who Killed JFK?: A Conspiracy Primer         From Castro to mobsters to the KGB, many theories still compete to answer one of history's biggest questions. Read More WATCH VIDEO: Forensics and the JFK Assassination A forensics expert sheds some light on the killing of President Kennedy. First South Americans Dined on Giant Sloths         Giant sloths were on the menu for humans that arrived in the Americas 30,000 years ago, a new study suggests. Read More WATCH VIDEO: How Old Is the Human Race? How long have humans been walking the planet? Turns out, the answer is in our genes! Space Observatories Zero-In on Comet ISON         As Comet ISON approaches the sun, our space-based robotic explorers have been keeping close tabs on the inner-solar system visitor. Read More WATCH VIDEO: Doomsday Asteroid How can we avoid the same fate as the dinosaurs? Video: What's in Your Poop?         Most adult animals on Earth share one thing in common: brown poop. But what's in it that makes it that particular color? Watch 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 © 2013 Discovery Communications, LLC