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EarthNew contender for Earth’s oldest rocks
Observing rare isotopes in rocks along the Hudson Bay in Northern Quebec suggest the rocks have remained intact for 4.28 billion years, making them Earth's oldest.
By Sid Perkins -
Health & MedicineWindow of opportunity for stroke treatment widens
Use of clot-busting drugs as long as 4½ hours after an event pays dividends later.
By Nathan Seppa -
PhysicsPhotons caught in the act
Physicists manipulated a microwave pulse and could essentially watch it transition from a quantum state into the realm of classical physics.
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Health & MedicineClosing in on Rett syndrome
Scientists find that a particular part of the mouse brain is responsible for behavioral abnormalities associated with Rett syndrome, an autism spectrum disease that strikes females.