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  1. Physics

    Electrons trip on tiny semiconductor steps

    A first glimpse of how a semiconductor's surface alters electrons' magnetic fields, or spins, suggests that tiny steps in the surfaces are tripping up efforts to create so-called spintronics circuits from semiconductors.

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  2. Health & Medicine

    Genetic flaw found in painful gut disease

    Scientists have discovered a genetic mutation that occurs in people with Crohn's disease, a digestive disorder that attacks the intestines.

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  3. Slave-making ants get rough in New York

    The whole ant slave-making business turns more violent in New York than in West Virginia, even though it features the same species.

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  4. Health & Medicine

    Poliovirus slaughters brain tumors in mice

    Scientists have altered a live polio virus, inducing it to target and kill brain tumor cells without causing polio.