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  • Semi-Precious Pebbles
    Where you find agates, volcanoes—the source of the gas bubbles—are usually not far way.
  • Five Steps of Volcanic Rock
    These falls are the record of a series of volcanic eruptions that happened in this area.
  • Fossil-Filled Limestone
    340 million years ago, a warm shallow sea covered all of the American Southwest.
  • Making Granite From Volcanic Rock
    It would take dramatic transformations to turn volcanic islands into the first continents.
  • Sneak Peek: Making Stuff Faster
    David Pogue learns the secrets to running faster.
  • David's Race
    What has UPS built into its trip-route algorithm to cut fuel and reduced carbon emissions?
  • Steffen's Plan
    Steffen's plan cut down on boarding time by over 50 percent.
  • Hagfish
    Researchers are interested in the eel-like hagfish, which produces a slimey goo.
  • Hagfish Defense
    The hagfish protects itself by releasing a mass of slime that chokes the predator.
  • Eye Robot
    Researchers guide this non-mechanical microrobot through the eye using external magnetics.
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