Acid Fog Likely Dissolved Rocks on Mars

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Acid Fog Likely Dissolved Rocks on Mars As if Mars' thin, frigid, dry air wasn't harsh enough, scientists have found new evidence of acid fog altering the rocks near the Spirit rover. READ MORE How Does Your Plastic Bag Get Into the Ocean? Even if you're far inland, the trash you discard can end up as plastic pollution at sea. READ MORE WATCH VIDEO: What's an Ocean Garbage Patch? Find out how much trash is really in our oceans. Yes, the Vatican Can Arrest People The Vatican's recent arrest of a priest and a laywoman for allegedly leaking confidential documents reveals a lesser known aspect of the Holy See. READ MORE WATCH VIDEO: How Powerful Is the Vatican? Can the Vatican protect itself? How Our Teeth Evolved from Ancient Fish Our teeth contain the hardest mineral in the human body -- enamel. What is it, why is it so tough, and how did we get it? 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