'Mystery' Mars Rock Flashes Rover its Bright Side

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'Mystery' Mars Rock Flashes Rover its Bright Side         We can now see the bright rock that strangely appeared in front of Opportunity in ruddy Mars color. Read More WATCH VIDEO: Curiosity and the Hunt for Life on Mars Could life have existed on Mars even before it flourished on Earth? Sloths' Dirty Bum Fur Grows Nutritious Algae         Food grows right on the bodies of sloths, which could be the world's best recyclers. Read More WATCH VIDEO: Why Parasites May Not Be All That Bad Parasites might be the most common form of life on Earth. How gross is that? Milk Drinking Still a Mystery         The mutation for milk-drinking evolved over the last 10,000 years as a result of natural selection. Why was it advantageous? Read More WATCH VIDEO: When Does Food Really Expire? Video Almost everything you buy from the grocery store has an expiration date. Learn what that date really means. Why Songs Get Stuck in Your Head: Video         So, you can't get that song out of your head? You probably have an earworm. Why is this happening? 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