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  1. Under the jungle, a more pluralistic Maya society

    Editor in chief Nancy Shute discusses how new scientific discoveries are rewriting the history of Maya society

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  2. Readers react to mysterious protists, bird brains, more

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  3. Astronomy

    A rare, extremely energetic cosmic ray has mysterious origins

    In 1991, physicists spotted a cosmic ray with so much energy it warranted an ‘OMG.’ Now that energetic particle has a new companion.

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  4. Animals

    These bats are the only mammals known to mate more like birds

    Male serotine bats have penises too large for penetration. To mate, the animals rub their genitals against each other, somewhat like birds’ cloacal kiss.