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Companies that offer Web-based e-mail or social networking can't always cooperate with court-ordered surveillance. That's because it's not always possible to create built-in eavesdropping systems, and those back doors can leave computers vulnerable to hacking and non-government spying.

For many students at Wellspring Academy in N.C., two months at this weight-loss boarding school have transformed them. Those who trailed behind their parents to check in back in August now own the campus. Kids who had watched from the sidelines while others exercised have turned into exercisers.

Top nuclear officials in India say the country's existing reactors are safe and that the next generation of power plants will be even safer. But some experts say the country's nuclear establishment is so secretive that it's impossible to say how safe the program may be.

A carving of a mammoth or mastodon on a fossilized bone, found years ago in Vero Beach, is being recognized as important early art. The find has sparked new interest in a site first excavated nearly a century ago.

The San Diego Unified School Board voted yesterday to place a parcel tax on the November ballot. Supporters hope the measure will save teaching jobs in San Diego.

Do embryonic stem cells hold the key to regenerative medicine that will cure diseases? Are there other kinds of stem cells that can do the same but without the controversial use of embryos? Scientists

The U.S. Geological Survey says a magnitude-4.6 earthquake has shaken a remote area of the Mojave Desert in Southern California.

Wounded soldiers often spend months in physical therapy rebuilding their strength; soldiers with traumatic brain injuries face an equally grueling challenge. Computerized mental exercises may be exhausting, but doctors and patients hope they will improve focus and memory.

Tornadoes have killed at least 530 people in the U.S. this year, the highest death toll since 1950. But researchers say they are working on new detection and forecasting technologies. One of those technologies got put to the test in May when this tornado touched down near Chickasha, Okla.

Citing cases from Gandhi and Martin Luther King Jr. to Abraham Lincoln and John F. Kennedy, psychiatrist Nassir Ghaemi argues in a new book that the struggles that accompany some mental illness — particularly mania and depression — make for better leaders in times of crisis.