500 Million-Year-Old ‘Mistake’ Led to Humans

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500-Million-Year-Old 'Mistake' Led to Humans         Over 500 million years ago a spineless creature experienced two doublings in DNA, triggering the evolution of humans and other animals. Read More WATCH VIDEO: Apes Giggle Like Humans Apes laugh similar to humans, according to new research exploring the evolution of laughter. July Scorcher Turns Greenland Into Slushy         July's record-breaking scorcher hit Greenland hard this month, melting 97 percent of the surface ice cover to some degree in just a few days. Read More WATCH VIDEO: Arctic Melt Caught on Tape Greenland's Petermann Glacier is poised to lose a Manhattan-sized chunk. Seeds of Supermassive Black Hole Found         Three examples of the rarest class of black hole may have been uncovered near the center of our galaxy. Read More WATCH VIDEO: Black Holes Did you know there's a black hole in the center of our galaxy? Is Your Medicine Melting?         The dog days of summer are here. Are you making sure your medicine is safe from the heat? Read More WATCH VIDEO: Can Drugs Make Us Smarter? When can we expect a pill for enhanced intelligence? 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 © 2010 Discovery Communications, LLC