Picture-postcard Guanabara Bay is the main attraction of the Olympic city's newest cultural center.

The Rio Art Museum commands a view of the bay's azure waters, and its exhibitions feature image after image of the bay, with 18th century maps, 19th century paintings and contemporary photos showcasing its watery expanse, its fringe of tropical vegetation and its iconic Sugarloaf Mountain.

Mobile money may seem like a hot concept, but consumers aren't warming to it.

At the world's largest cellphone trade show, in Barcelona this week, the 70,000 attendees are encouraged to use their cellphones —instead their keycards— to get past the turnstiles at the door. But very few people took the chance to do that. The process of setting up the phone to act as a keycard proved too much of a hassle.

Increased awareness and use of electronic cigarettes in the U.S. outlined in a study released Thursday highlights the need for government regulation and evaluation, the head of the Centers for Disease Control and Prevention's office on smoking and health said.

Nearly six in 10 adults in the U.S. are aware of the battery-powered devices that heat a liquid nicotine solution and create vapor that users inhale, according to the first study to assess the change in awareness and use of electronic cigarettes on a national level. The CDC report published in the journal Nicotine & Tobacco Research also said about one in five current smokers reported having used an electronic cigarette.

Five days after its biggest win at Camp Nou in more than a decade, Real Madrid hosts Barcelona again Saturday in the Spanish league with its decisive Champions League match at Manchester United looming.

Madrid's defense did a masterful job of neutralizing Barcelona forward Lionel Messi on Tuesday, and its counterattack speared by Cristiano Ronaldo did the rest as the Portugal forward scored twice in the 3-1 win to put Madrid into the Copa del Rey final.

A match-fixing investigation in Lebanon produced no evidence that a national team defender helped Qatar win a 2014 World Cup qualifier, the Asian Football Confederation said Thursday.

Attempting to control widespread speculation on the match, the Asian governing body said it studied a summary report from an investigation into match-fixing and bribery ordered by the Lebanon Football Association.

If dresses could talk, this dark navy, figure-hugging velvet number would have the best stories to tell.

Princess Diana wore it on state visits, at royal banquets, and most memorably to a gala dinner at the White House in 1985, when she took to the dance floor with Hollywood star John Travolta.

Jimmy Buchheim is behaving oddly.

On the floor of the world's largest cellphone trade show in Barcelona, Spain, he's looking at the screen of his iPod Touch, taking a few steps, and then looking again. Now and then he backtracks or turns, and looks again. Slowly, he confines his movements to a smaller and smaller area. Then he drops to his knees, and checks the screen again. He scrabbles forward.

On a sunny day at a picnic table in Silicon Valley, Eric Migicovsky glanced down at his wristwatch. He wasn't checking the time, he was checking his email. Glancing up, he grinned. The message was from yet another journalist.

In this corner of a world obsessed with the latest tech gadget, Migicovsky is this week's hotshot as his start-up company rolls out its new, high-tech Pebble smart watches. The $150, postage stamp-sized computer on a band is tethered wirelessly to a wearer's Android or iPhone.

There's a new spin on supermassive black holes: They're incredibly fast, astronomers say.

It's long been suspected that gigantic black holes lurking in the heart of galaxies rotate faster and grow larger as they feast on gas, dust, stars and matter. But there hasn't been a reliable measurement of the spin rate of a black hole until now.

Researchers steering a remote-controlled submarine around the world's deepest known hydrothermal vents have collected numerous samples from sunless depths of the Caribbean Sea where blazing hot, mineral-rich fluid gushes from volcanic chimneys that look like gnarled tree stumps.

Jon Copley, chief scientist for the expedition of Britain's National Oceanography Center, said Wednesday he believes that laboratory analysis in the coming months will reveal some new life forms that have evolved in the pitch-black vent areas of the Cayman Trough, more than 3 miles (5 kilometers) below the sea's surface between the Cayman Islands and Jamaica.