Mona Lisa May Conceal Second Portrait

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online CO2 Isn't Spurring Plant Growth as Expected When it comes to stopping catastrophic climate change, we can't just count on plants to bail us out. READ MORE Why Trump's Negativity Is Working Trump repeatedly refers to others as stupid, morons, dummies and losers. It's an unusual strategy; here's why it's working for him. READ MORE WATCH VIDEO: What Rights Do Refugees Have? European countries are forced to change policies toward new faces on their borders. New Frog Found in Tiny Water Pool in Plant A newly discovered frog lives a fairytale existence in a mini, nature-made swimming pool formed by the leaves of a tropical plant. READ MORE WATCH VIDEO: Frog Hears with Its Mouth Check out the four craziest animal senses. Sociopath vs. Psychopath: What's the Difference? While the two share some personality traits, they differ in key ways. 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