The U.S. electrical grid is a complex system of power plants, transmission lines, and local distribution networks that deliver power to homes and businesses. It comprises three major grids - Eastern, Western and Texas - which are divided into hundreds of smaller sections. A summary of how power flows on the system, who oversees it and what went wrong in the August 2003 blackout:
WASHINGTON (AP) - Scientists who sparked an outcry by creating easier-to-spread versions of the bird flu for research purposes want to try such experiments again using a worrisome new strain. This time around, the U.S. government is promising extra scrutiny of such high-stakes research up front.
NEW YORK (AP) - The U.S. electrical grid is better managed and more flexible a decade after its largest blackout but remains vulnerable to increasingly extreme weather, cybersecurity threats, and stress caused by shifts in where and how power is produced.
DETROIT (AP) - Nearly 51 hours after jumping into a lake near the Michigan-Canada border, a long-distance swimmer who calls himself "The Shark" finished his 22-mile journey to Detroit while hauling hundreds of pounds of bricks.
LOS ANGELES (AP) - In a rare diplomatic rebuke, President Barack Obama called off an upcoming Moscow summit with Russian President Vladimir Putin on Wednesday, sending a stern message of disapproval over Russia's harboring of National Security Agency leaker Edward Snowden.
INDIANA COMMUNITY HANDS OUT DRUG TESTING KITS: LAWRENCEBURG, Ind. (AP) - A southeastern Indiana school is distributing kits so parents can test their children for drug use.
RENO, Nev. (AP) - A biker gang leader was convicted of murder Wednesday in the 2011 killing of a Hells Angels member at a Nevada casino that authorities said was part of an orchestrated assassination plot to take out a high-ranking official of the rival group.
WASHINGTON (AP) - Smartphones don't make smart babies, an advocacy group declared Wednesday in a complaint to the government about mobile apps that claim to help babies learn.
ATLANTA (AP) - Higher blood-sugar levels, even those well short of diabetes, seem to raise the risk of developing dementia, a major new study finds. Researchers say it suggests a novel way to try to prevent Alzheimer's disease - by keeping glucose at a healthy level.
DES MOINES, Iowa (AP) - The allure of capturing the estimated $425 million Powerball jackpot had players in a buying frenzy Wednesday, further confirming a trend that lottery officials say has become the big ticket norm: Fatigued Powerball players, increasingly blase about smaller payouts, often don't get into the game until the jackpot offers big bucks.
FORT HOOD, Texas (AP) - On the first day Maj. Nidal Hasan went on trial in a fight for his life, he claimed responsibility for the 2009 shooting rampage at Fort Hood. He posed no questions to most witnesses and rarely spoke. On one of the few times he did talk, it was to get on the record that the alleged murder weapon was his, even though no one had asked.
LOS ANGELES (AP) - Coastal waters off California are getting more acidic. Fall-run chinook salmon populations to the Sacramento River are on the decline. Conifer forests on the lower slopes of the Sierra Nevada have moved to higher elevations over the past half century.
NEW YORK (AP) - Publishers who have settled an electronic book pricing dispute with the federal government objected Wednesday to penalties the government wants to impose on Apple Inc., saying it will hurt publishers rather than the personal electronics giant.
North Bend, Ore. (AP) - David Wonnacott qualified for a tattoo license on July 5 and wasted little time establishing a business in a small, coastal Oregon community. Problem is, police said, he did it with a gun.
SECAUCUS, N.J. (AP) - The Children's Place has stopped selling a T-shirt that sparked complaints of sexism.
ALEXANDRIA, La. (AP) - A Mississippi man who was once declared dead, only to resurface as a suspect in a kidnapping and killing, was sentenced to death Friday after a jury earlier convicted him of murder.
SPRINGFIELD, Mass. (AP) - A man who has bumps resembling horns implanted in his forehead was found guilty of murder and other charges Friday for his role in the kidnapping and slaying of three Massachusetts men in 2011.
RALEIGH, N.C. (AP) - A North Carolina inmate with mental illness who died of thirst was held in solitary confinement for 35 days and cited twice for flooding his cell, according to prison records.
COLUMBIA, S.C. (AP) - A South Carolina state trooper's dashboard video shows an unarmed driver being shot just seconds after he was stopped for a seatbelt offense - and the trooper, who was fired last week, has now been charged with assault.
WASHINGTON (AP) - Eric Holder, America's first black attorney general and an unflinching champion of civil rights in enforcing the nation's laws, announced his resignation Thursday after leading the Justice Department since the first days of President Barack Obama's term. He is the fourth-longest-serving attorney general in U.S. history.
ANCHORAGE, Alaska (AP) - A powerful earthquake shook a large swath of Alaska on Thursday morning, knocking things off shelves and causing people to take cover but bringing no immediate reports of injuries or major damage.
BEIRUT (AP) - When the United States opened its aerial campaign against the Islamic State group in Syria this week, its first salvo also hit an al-Qaida cell it says was planning terror attacks - a move that has injected more chaos into the conflict and could help President Bashar Assad.
POLICE: BURGLAR KILLS ACCOMPLICE OVER STOLEN ITEMS: WEST COLUMBIA, S.C. (AP) - South Carolina authorities say a burglar fatally shot his accomplice after the two men argued about how to split up the stolen goods.
CARPINTERIA (AP) - A California woman is recovering from scratches, a bite and a broken rib after being attacked by a black bear that chased her dogs through an avocado grove.
WASHINGTON (AP) - The FBI director on Thursday criticized the decision by Apple and Google to encrypt smartphones data so it can be inaccessible to law enforcement, even with a court order.
CUPERTINO (AP) - Apple's response to a high-profile gaffe involving its iPhone software may be more important than the glitch itself.
SOIUTH JORDAN, Utah (AP) - Parents and students at a Utah high school say they're angry at the way school administrators enforced a dress code at a homecoming dance.
SPOKANE, Wash. (AP) - The author of Washington's recreational marijuana law has suggested that Spokane test its sewage for traces of the cannabis chemical THC, to get a more accurate picture of pot use by residents.
UNITED NATIONS (AP) - Confronted by the growing threat of Middle East militants, President Barack Obama implored world leaders at the United Nations Wednesday to rally behind his expanding military campaign to stamp out the violent Islamic State group and its "network of death."
NEW YORK (AP) - Vietnam said Wednesday it wants to be able to buy weapons from the United States and that regional powerhouse China should not be alarmed.