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PhysicsElectrons 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.
By Peter Weiss -
Health & MedicineGenetic 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.
By Nathan Seppa -
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.
By Susan Milius -
Health & MedicinePoliovirus slaughters brain tumors in mice
Scientists have altered a live polio virus, inducing it to target and kill brain tumor cells without causing polio.