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  1. 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.

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  2. Health & Medicine

    A brain-monitoring device may one day take the guesswork out of anesthesia

    The automated device pairing brain activity and dosing kept two macaques sedated for 125 minutes, raising hopes of precision anesthesia for people.

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  3. Animals

    The first embryos from a mammal have now been grown in space

    Mouse embryos in space can develop into clusters of cells called blastocysts. The result is a step toward understanding how human embryos will fare.