The Oldest Masks in the World: Photos

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The Oldest Masks in the World: Photos         These 9,000-year-old limestone masks are the most ancient human portraits from the Stone Age. Read More WATCH VIDEO: Mythical Viking Sunstone Is Real How were the Vikings such remarkable mariners? The answer is in a 16th-century shipwreck. Sponges Likely Paved the Way For All Life on Earth         Sponges led to more oxygen in oceans, setting the stage for complex forms of life that included our distant ancestors. Read More WATCH VIDEO: The Ocean Is in Danger! Anthony looks at the dire state of perhaps the most interesting and diverse part of our planet. How to Fingerprint Clouds         Open-ocean clouds have been found to contain biological substances that can be traced to the waters where they formed. Read More WATCH VIDEO: Investigating Shiny Night Clouds Do you ever wonder why you can sometimes see clouds at night? Sound Machines Are Hurting Babies: Video         It's common for parents to use white noise sound machines for their babies, but is this safe? 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