Two primates have learned to operate a prosthetic arm using only visualization exercises, scientists report in the latest advance in brain-machine interfaces.

The Vatican has reopened the Valeri Mausoleum, the largest and most luxurious of 22 pagan tombs buried under St. Peter's Basilica, the Associated Press reports.

The remarkably well-preserved fossil, discovered in the Australian outback, is the earliest known record of vertebrate sex, a new study finds.

Fearing landslides or a dam collapse, Chinese soldiers opened a drainage path for one of many new lakes formed by the May 12 earthquake.

NASA's Phoenix Mars Lander has begun sending back images from the red planet after a smooth landing on Sunday.

The 54-million-year-old "Danish blue"—nicknamed in honor of a Monty Python sketch—skimmed the skies when Europe was tropical, a new study says.

See Amazon Indians protest with machetes, French fishers send up flares over fuel prices, Chinese workers erecting "instant" houses for quake victims, and more.

A TV crew in Japan has captured a 45-second glide believed to be the longest recorded flight of a flying fish.

The tiny grooming tool discovered on the seafloor off Key West, Florida, is just the latest treasure revealed during the hunt for the shipwrecked Spanish galleon Santa Margarita.

A boat called Earthrace is on a mission to break the speed record for circumnavigating the globe—powered entirely by biodiesel.

An 11th-century ruin in a dusty reservoir has become one of the most striking images of Spain's record drought, which already has forced Barcelona to ship in drinking water for the summer.

Mantis shrimp see 11 or 12 primary colors, as opposed to our humble 3. Now a new study says they can see rare forms of polarization too.

Amid stormy debate, British lawmakers have voted to allow the use of human-animal hybrid embryos for stem cell research.

Real-life rocket man Yves Rossy soared through the Alps this week on his first demonstration flight with a self-made flying contraption.

See "Fusion Man" fly via a jet-powered wing on his back, a giant beetle escape a smuggler, volcanic ash falling eerily, and more.