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  1. Chemistry

    Hydrogen: The Next Generation

    Researchers are looking for more sustainable ways to generate hydrogen, which burns cleanly but is typically made from fossil fuel.

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  2. 19096

    The Japanese have developed an “artificial shark-fin machine” that produces a product quite similar in texture to the real thing. It’s being used in restaurants in Hong Kong. Let’s hope people’s tastes change before it is too late for the sharks. P.W.L. KwanBoston, Mass.

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  3. Earth

    Clipping the Fin Trade

    New research and policy developments aim to curb the wasteful and gruesome practice of killing sharks solely for their fins.

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  4. Math

    Tilt-A-Whirl Chaos (II)

    Tilt-A-Whirl in action.