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  1. Neuroscience

    Playful behavior in rats is controlled by a specific area of their brains

    Cells in a brain region called the periaqueductal gray are activated by chasing and tickling, a study finds. Blocking their activity reduces play in rats.

    By Simon Makin
  2. Climate

    Cow poop emits climate-warming methane. Adding red algae may help

    Adding a type of methane-inhibiting red algae directly to cow feces cut down methane emission from the poop by about 44 percent, researchers report.

    By Carolyn Gramling
  3. Math

    How geometry solves architectural problems for bees and wasps

    Adding five - and seven - sided cells in pairs during nest building helps the colonyfit together differently sized hexa gonal cells , a new study shows.