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California and federal public health officials say valley fever, a potentially lethal but often misdiagnosed disease infecting more and more people around the nation, has been on the rise as warming climates and drought have kicked up the dust that spreads it.

A Southern California wildfire grew to 8,000 acres and is threatening 2,000 homes. The blaze damaged 15 homes and caused the evacuation of other homes and the campus of California State University Channel Islands, fire officials said.

One night nurse got away with medical murder in at least nine hospitals over the course of his 16-year career.

Clinical trials for a new technique pioneered by Danish researchers are underway, and doctors are optimistic.

A huge explosion tore through a fertilizer plant in a small central Texas town on Wednesday night, killing as many as 15 people and injuring more than 160 others, laying waste to buildings and potentially sending toxic fumes into the air, the authorities said.

Expect to see more people in uniform, a greater display of law enforcement firepower, added security in places where it had been relaxed and increased efforts to poke into backpacks and purses.

The London Marathon is set for April 21. Officials say the best way to show solidarity after the Boston Marathon attacks is to go forward.

Two explosions near the finish line of Monday's Boston Marathon have left at least three people dead and more than 130 injured. The devices detonated on the sidelines of the racecourse, causing both runners and spectators to flee in every direction. A pair of white smoke clouds enveloped the sidelines.

In the wake of the Boston Marathon explosions, police and race directors around the world will face heightened pressure to tighten security at outdoor competitions that draw tens of thousands of spectators. It won't be easy.

A new strain of bird flu in China has killed nine and infected 28 others. Health officials are gearing up against the disease.

All 104 nuclear power reactors now in operation in the United States have a safety problem that cannot be fixed and they should be replaced with newer technology, the former chairman of the Nuclear Regulatory Commission said.

A Nevada jury said two UnitedHealth Group Inc. units should pay a total of $500 million in punitive damages on top of $24 million in compensatory damages in a case involving two members who contracted hepatitis C.

American hunters watch out: The animal rights group PETA says it's going to launch drones to make sure you're abiding by the law.

Europe launched its first space weather coordination centre Wednesday to raise the alarm for possible satellite-sizzling solar storms that also threaten astronauts in orbit, plane passengers and electricity grids on Earth.

Authority-driven incentives and enforcement are needed if we are to expect environmental insurers to bear the social responsibility of reducing pollution events in countries where pollution liability insurance is compulsory.