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TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Mona Lisa May Conceal Second Portrait A light reflection technique reveals the outlines of what a researcher claims is a separate portrait under Da Vinci's Mona Lisa. READ MORE Shocking Facts About Gun Control The Second Amendment has been the subject of debate for centuries now; you might be surprised to find where that still-unsettled dispute has led the United States. READ MORE WATCH VIDEO: Bill Gates Donates $1 Million to Gun Control Get the details of the gun bill that Gates supported. Selfish Dog Moms Fueled Domestication Ancestors of today's dogs might have preferred life with humans over time spent with their own mothers. READ MORE WATCH VIDEO: Why Dogs Spin Before They Poop Surprisingly, it involves Earth's magnetic field. Why Crows Are High-IQ Problem Solvers If you needed to work out a problem, but could only use a bird to do it, your best bet would be to hire a crow. WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC