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Climate simulations show that massive technological interventions, known as "geoengineering," could protect food crops from some of the damaging effects of global warming. But researchers say local effects are hard to predict, so geoengineering may not be worth the risk.

Homeless people may stand a better chance of improving their health when offered a permanent place to live without a requirement for sobriety, the results from a Seattle center suggest.

The court said that placing GPS device on a suspect's vehicle constitutes a search, meaning a warrant is required.

The Inquisition revolutionized record-keeping and surveillance techniques that are still used today, says Cullen Murphy. His new book God's Jury draws parallels between some of the interrogation techniques used in previous centuries with the ones used today.

Sue Freeman, 78, is one of two women who appear to have unexpectedly regained some of their vision while taking part in a study testing the safety of an embryonic stem-cell therapy. The findings, if confirmed, could mark a landmark step in stem cell therapy, but everyone involved in the work is being very cautious about how they describe these results.

The Arizona congresswoman met with constituents and staffers who survived last year's shooting rampage. Giffords announced Sunday that she was resigning her seat to focus on her recovery.

More than a decade after the U.S. charged into Afghanistan, American troops are still in the lead combat role. But with the U.S. military planning to withdraw by the end of 2014, the Americans now want to see Afghan troops at the forefront of the fighting.

Staff Sgt. Frank Wuterich pleaded guilty to dereliction of duty, which carries a maximum sentence of three months confinement.

Women don't suffer in silence. They report feeling more pain than men from such common conditions as ankle sprains and sinus infections, a Stanford study finds. A better understanding of gender differences in pain could lead to better treatments.

The U.S. Supreme Court ruled Monday that police must obtain a warrant before placing a GPS tracking device on a vehicle. The decision was unanimous, but three separate opinions on the legal rationale show that even Supreme Court justices have conflicting views of privacy in the information age.