A prison official in southern Virginia says John Allen Muhammad, the sniper who terrorized the Washington, D.C.-area with a young accomplice in 2002, seemed "quiet and relaxed" before being put to death by lethal injection Tuesday night.

Even though the country has become more pessimistic, President Barack Obama still enjoys the confidence of a majority of Americans. An Associated Press-GfK poll shows that he has an approval rating of 54 percent. But it also says the number of people who think the country is heading in the wrong direction has increased.

Transmission problems at a huge hydroelectric dam in Brazil caused a massive power outage Tuesday night, leaving millions in several major cities without electricity for hours. The lights have since come back on, but the incident is another black eye for the South American country set to host the 2016 Olympic Games.

A new study by Consumer Reports finds what it deems unhealthy levels of bisphenol A, or BPA, in a variety of canned foods. Although this preservative has been linked to diseases in animals, industry groups insist it is safe. Two recent measures in Congress are calling for a ban on BPA, and both the FDA and EPA plan to study the issue in coming months.

Researchers are ranking the 50 U.S. states according to which have the happiest residents. In general, they say, the states with wealthier, better educated and more tolerant residents are the happiest. Well-being is highest in the Mountain and West Coast states, followed by the Eastern Seaboard.

NASA marks the 400th anniversary of the telescope by releasing one of the most detailed images to date of the heart of the Milky Way. The image, a composite created by the Hubble and Spitzer space telescopes and the Chandra X-ray Observatory, will go on display at scores of planetariums, libraries and schools.

The toast of the auction circuit this week is a bottle of beer recovered from the famous Hindenburg crash in New Jersey more than 70 years ago. The modest drink, which still bears a Lowenbrau label, is expected to become the most expensive beer ever sold, the auction house says.