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  1. Tech

    Refueling Rockets

    Hybrid-rocket fuels—part solid, part liquid—have been around for a half-century, and they may just now be taking off.

    By Jessica Gorman
  2. Math

    Defending the Roman Empire

    Years ago, when I was in high school and college, the board games Risk and Diplomacy served as wonderful playing fields where I could develop and exercise my tactical and negotiating skills. One issue that often came up in my forays into international intrigue was how to deploy my limited forces to defend far-flung territories […]

    By Ivars Peterson
  3. Health & Medicine

    More than a Kick

    Nicotine ramps up activity throughout the body, making the drug a suspect in many tobacco-related ailments.