How Old Is E.T.?

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How Old Is E.T.?         Could Homo sapiens be amongst the first of the intelligent civilizations to emerge? Read More WATCH VIDEO: Battle: Los Angeles Would aliens really attack a U.S. city? If so, why? Cities Facing Sea Level Rise         This summer may be one of the last to visit some cultural destinations threatened with inundation from rising oceans. Read More WATCH VIDEO: Cities Are Like Stars People living in big cities have a lot in common with ... the inside of a star? Wildfire Hotshots: Heroes on the Front Lines         Hotshot crews, like the one that perished in Arizona, are trained to handle complex fires. Read More WATCH VIDEO: Prescribed Fires Help Prairies Why would the Nature Conservancy set 80 acres of prairie ablaze? Do Ghosts Exist?         According to some studies, a whopping third of Americans believe in ghosts. We decided it was time to look at the shaky science behind the paranormal. 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