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.

The New York Knicks overcame Golden State guard Stephen Curry's NBA season-high 54 points to beat the Warriors 109-105 on Wednesday.

Carmelo Anthony scored 35 points and J.R. Smith hit the tiebreaking shot with 1:10 left to help give the Knicks the win.

Rafael Nadal's return from injury gathered pace Wednesday as the former world No. 1 downed Argentina's Martin Alund 6-0, 6-4 to reach the Mexican Open quarterfinals.

The second-seeded Nadal made short work of the first set before fending off a more determined Alund in the second to finish the match in just over 85 minutes Alund at the clay court tournament.

Atletico Madrid lined up a Copa del Rey final against city rivals Real Madrid after drawing 2-2 with a Sevilla side that finished with nine men on Wednesday.

First-half goals by Diego Costa and Radamel Falcao in the semifinal, second leg match secured a 4-3 victory on aggregate, following a 2-1 home win last month.

UEFA banned Zlatan Ibrahimovic for two European matches on Wednesday, ruling the influential forward out of the Champions League quarterfinals, first leg if Paris Saint-Germain advances.

UEFA said its disciplinary panel extended an automatic one-match sanction for Ibrahimovic's challenge on Valencia midfielder Andres Guardado in stoppage-time of a last-16, first-leg match this month.

Worn down by constant criticism by fans, Rafael Benitez announced Wednesday he would leave Chelsea at the end of the season during an extraordinary post-match outburst in which he also took aim at the Premier League club's hierarchy.

The Spanish coach snapped during the news conference after an FA Cup fifth-round win at Middlesbrough, saying his position had been untenable ever since he was handed the title "interim manager" until the end of the 2012-13 campaign.

Dennis Bergkamp will become the fourth Arsenal great to be immortalized by the Premier League club with a statue outside Emirates Stadium, honoring his contribution to the club.

Arsenal said the statue of the former Netherlands forward "is still in its early construction phase" and will be unveiled before the start of next season.