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  1. Math

    Quilting Pi

    The digits of pi inspire artistic quilts. For more math, visit the MathTrek blog.

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  2. Humans

    From the May 2, 1936, issue

    Atomic bullets, exploding cornstarch, and an unstable solar system.

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  3. Tech

    Aircraft Photos

    The Dryden Flight Research Center is NASA’s center for aeronautical flight research and atmospheric flight operations. The Center’s Web site has an extensive photo collection, which features images of many of the research and experimental aircraft flown at the test facility, from the 1940s to today. Go to: http://www.dfrc.nasa.gov/Gallery/Photo/index.html

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  4. Blood Sucker: Like the adult heart, the developing heart takes advantage of suction

    The embryonic heart works more like the adult heart than scientists had long assumed.