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  1. Math

    Free Choice + Punishment = Cooperation

    In a computer simulation of a multi-player game, cheaters didn't prosper when other participants could choose not to play.

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  2. Humans

    From the July 10, 1937, issue

    Photographing the earliest developmental stages of opossum eggs, a 'heavy electron' in cosmic rays, and teaching chimpanzees to use sign language.

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  3. Physics

    Pulling Strings: Stretching proteins can reveal how they fold

    Unfolding a single protein by pulling on its ends reveals the molecular forces that make it fold up.

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  4. Forget About It: How the brain suppresses unwanted memories

    Two newly discovered neural processes give people the ability to intentionally forget upsetting memories.