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  1. Earth

    Invasive, Indeed

    Some people may live lightly on the land, but the demands of the world's population as a whole consume nearly a quarter of Earth's total biological productivity.

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  2. Tech

    Disappearing Ink

    Coming to your tattoo parlor soon: New inks that allow clients to have their designs cleanly erased if embarrassment or regret sets in.

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  3. Humans

    From the October 2, 1937, issue

    The mystery and magnificence of volcanoes, how bees dance to tell their hive-mates which flowers to visit, and the year's polio cases begin to decline.

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  4. Health & Medicine

    Yummy Bugs

    Do you enjoy chocolate? You can make it more nutritious by bugging it—with crickets, for example.