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  1. Paleontology

    This giant marsupial was a seasonal migrant

    A new analysis suggests that Diprotodon optatum, a giant plant-eating marsupial that went extinct about 40,000 years ago, migrated long distances, much like today’s zebras and wildebeests.

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  2. Animals

    To test sleep, researchers don’t let sleeping jellyfish lie

    Upside-down jellyfish are the first known animals without a brain to enter a sleeplike state.

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  3. Physics

    Turning up the heat on electrons reveals an elusive physics phenomenon

    Heating a strip of platinum creates a “spin current” in the material’s electrons due to the spin Nernst effect.

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  4. Health & Medicine

    About 1 in 5 teens has had a concussion

    Almost 20 percent of U.S.