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U.S. authorities have declared a red alert --the highest alert level -- for air traffic between the United States and Great Britain. The alert level is orange for the rest of U.S. aviation. All U.S. air travelers are banned from carrying liquids and gels on board. The prohibitions will be in place until screening processes can be reassessed.

A security guard at the Tops market tried to fire back at the shooter, but his fire struck body armor instead. Experts say use of body armor by mass shooters has trended up in recent years.

Scientists went to extraordinary lengths to eradicate smallpox from the world. Rahima Banu is now recorded as having the last known naturally-occurring case of the deadly form.

To stop the spread of HIV among populations where the infection is on the rise, federal health experts are proposing HIV testing as a routine part of medical care. The hope is that people who know they are infected would seek care and would not infect others. But there is a risk that without proper counseling and resources, people who test positive may be afraid to come forward for treatment.

General Motors posted a second-quarter loss of $3.2 billion Wednesday -- but company officials say the loss includes more than $4 billion in special one-time charges related to downsizing. The news sent shares of GM to a 10-month high. From member station WDET in Detroit, Jerome Vaughn reports.

In a remote region of Russia's Arctic Far North, residents say they're the latest victims of President Putin's drive to reshape his county into a global power. Last month, authorities jailed the region's governor, Alexei Barinov, on charges of fraud and embezzlement. But citizens say the move was part of a plan.

Like many people with autism, Temple Grandin struggles with language and also with personal relationships. Scientists say that's probably not a coincidence, as research increasingly suggests that language depends as much on social skills as grammar.

In a report released Thursday, the Senate Indian Affairs Committee calls the depth and breadth of misconduct by convicted lobbyist Jack Abramoff, and ex-Congressional aide Michael Scanlon, "astonishing."

U.S. and Iraqi government troops move deeper into the insurgent stronghold of Ramadi, as an overnight operation thrusts into the eastern part of the city, an area previously under insurgent control. Since U.S. forces captured the nearby town of Fallujah in November of 2004, Ramadi has been a main base of the insurgency.

British Prime Minister Tony Blair and Gov. Arnold Schwarzenegger (R) have signed a pact that makes the United Kingdom and the state of California partners in the battle against global warming. After meeting with business leaders at the Port of Long Beach on Monday, they agreed to share technology and research.