Philae's Comet Touchdown: Listen to the Sound

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Listen to the 'Crunch' of Philae's Comet Touchdown         Hear what it sounded like when Philae made its first touchdown on the dusty surface of Comet 67P/Churyumov-Gerasimenko. Read More WATCH VIDEO: The U.N.'s Plan to Defend Earth From Asteroids The U.N. has announced it's undertaking an effort to protect the planet from killer asteroids. Ferguson Follows Long History of Civil Unrest in US         The protests in Ferguson, Mo., are just the most recent in a long history of unrest following violence against unarmed African Americans. Read More WATCH VIDEO: Why Are Police Allowed to Use Lethal Force? What are the legal grounds for police to use deadly force? Why Dogs Are Sloppier Drinkers Than Cats         One explanation is dogs smash their tongues on the water surface as they drink, while cats use an elegant plunge and pull method. Read More WATCH VIDEO: Cats Drink Differently Than Dogs Dogs use a plunk and scoop method while cats delicately lap liquids with only the tip. Your Brain on 'Smart Drugs' Could Make You Dumber         If you're already intelligent, but you decide you need to take a "smart drug" like Modafinil, you might be in for a surprise. 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 © 2014 Discovery Communications, LLC