In a laboratory under the Swiss Alps, a 17-mile (27-kilometer) circular particle accelerator—the world's largest—may help answer the oldest questions known to humans.

See a supercell light up the Texas sky, U.S. Marines braving a sandstorm in Afghanistan, the Olympic torch reach the top of Mount Everest, and more.

Mass extinctions and other nightmare scenarios figure into one expert's speculations on what Earth would be like at 6°C (10.8°F) warmer.

People living in the earliest known settlement in the Americas relied partly on seaweed, bolstering the theory that the New World was settled via a coastal route, a new study says.

Thousands of horses, cows, and other livestock face a possibly toxic brew of deep ash and gases. And the region's all-important farms may be devastated for decades.

A new "Greendex" survey tracking consumer spending habits also found that the residents of the U.S. and other industrialized nations are the most wasteful.

Doctors in Australia believe the bionic eye they've created is safer than similar devices developed in other countries.

After 9,000 years Chaiten volcano has exploded back to life, forcing people to flee its southern Chile region.

Debate has heated up over a controversial theory that suggests huge comet impacts wiped out North America's large mammals nearly 13,000 years ago.

Pioneering measures developed at a Costa Rican agricultural school are helping growers across the world lessen the environmental impact of the popular fruit.

See half-naked—but all red—revelers get medieval, a Hollywood landmark go up in smoke, skulls stare into the Paris underworld, and more.

Greensburg, Kansas, was nearly destroyed by a tornado in May 2007. Today the town is rebuilding and living up to its "green" name.

Jaw and facial structures in the ancient human relatives show that they could open unusually wide, although researchers are stumped as to why they had this ability.

Rising sea temperatures may be causing the spread of oxygen-starved "deserts" in the world's tropical oceans, researchers say.

An Australia company is testing what could be the undersea equivalent of a wind farm. Their devices would capture wave energy and convert it to electricity.