How to Choose the Perfect Gift

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How to Choose the Perfect Gift         Top tips: Avoid giving money. And get people things they want but feel guilty buying for themselves. Read More WATCH VIDEO: Evolution Punishes the Selfish You'd think being selfish would help a species survive, but you'd be wrong! Find out why. Liquid Water Beneath Greenland May Swell Sea Level         An aquifer the size of Ireland is likely to change the way we see Greenland's role in sea level rise. Read More WATCH VIDEO: Who Owns the North Pole? No one (besides Santa, of course) claims ownership over the North Pole ... but that may soon change. DNA Motor Pulls Itself Across Carbon Nanotube         The motor could be useful for delivering drugs to specific areas in the body, among other tasks. Read More WATCH VIDEO: Memories Can Be Passed Down Through DNA Can memories really be inherited? A new experiment suggests they can. Paper or Plastic: Which Is Worse?         For cities around the world, the fight over which pollutes more is more complicated than you'd think. 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