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  1. Earth

    Nations sign on to persistent-pollutants ban

    The United States joined 126 other nations in signing a treaty to ban or phase out a dozen persistent and toxic pollutants.

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  2. Ecosystems

    Parrot survey finds poaching but also hope

    The largest review yet of wild parrot nesting finds poaching worrisomely frequent but also sees cause for hope in the efects of a U.S. protection law.

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  3. Teens’ ADHD treatment gets low-dose boost

    Teenagers diagnosed with attention-deficit hyperactivity disorder may reap substantial academic benefits from treatment that combines behavioral training with low doses of stimulant medication.

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  4. Gene variations police the storage of fat

    Researchers have uncovered genetic variations controlling a calorie-draining spigot in the body.