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  1. Math

    Can’t Knock It Down

    Mathematicians have found three-dimensional shapes that flip themselves upright from any position.

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  2. Humans

    From the April 3, 1937, issue

    Life in glass and the science of gambling.

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  3. Ecosystems

    The Great Turtle Race

    This international conservation event involves 11 leatherback turtles that are “racing” toward feeding areas south of the Galapagos Islands. Pick your favorite of these endangered animals and follow its progress, as tracked by satellite, from April 16 to April 29. Go to: http://greatturtlerace.com

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  4. Planetary Science

    No Escape: There’s global warming on Mars too

    The overall darkening of Mars' surface in recent decades has significantly raised the Red Planet's temperature, a possible cause for the substantial, recent shrinkage of the planet's southern ice cap.