Scientists working on the world's largest atom smasher say they are now circulating beams of protons in opposite directions at the same time in the $10 billion machine after more than a year of repairs.

Getting one of the roughly 11,500 permits granted each year to backpack overnight in the Grand Canyon has become so competitive and "unfair" that managers at the national park have decided to change the system.

Since the 1997 international accord to fight global warming, climate change has worsened and accelerated -- beyond some of the grimmest of warnings made back then.

The creatures living in the depths of the ocean are as weird and outlandish as the creations in a Dr. Seuss book: tentacled transparent sea cucumbers, primitive "dumbos" that flap ear-like fins, and tubeworms that feed on oil deposits.

A leading climate change scientist whose private e-mails are included in thousands of documents that were stolen by hackers and posted online said Sunday the leaks may have been aimed at undermining next month's global climate summit in Denmark.

Sixty-five world leaders have said they will attend the Copenhagen climate summit in December, and several more have responded positively to invitations, Danish officials said Sunday.

An auction house says it is selling a rare first edition of Charles Darwin's "On the Origin of Species" found in a family's guest lavatory in southern England.

Vladimir Gapor is a plumber by trade, but now he's a scavenger, prying bits of scrap steel from the ruins of his old factory and selling them for a pittance.

Computer hackers have broken into a server at a well-respected climate change research center in Britain and posted hundreds of private e-mails and documents online -- stoking debate over whether some scientists have overstated the case for man-made climate change.

Scientists are preparing the world's largest atom smasher to explore the depths of matter after successfully restarting the $10 billion machine following more than a year of repairs.

The mother who gave up conjoined Bangladeshi newborn twins for adoption said Saturday she is overjoyed the toddlers have been successfully separated and wants them to grow up in Australia.

A Vatican researcher has rekindled the age-old debate over the Shroud of Turin, saying that faint writing on the linen proves it was the burial cloth of Jesus. Experts say the historian may be reading too much into the markings, and they stand by carbon-dating that points to the shroud being a medieval forgery.

Two fingers and a tooth removed from Galileo Galilei's corpse in a Florentine basilica in the 18th century and given up for lost have been found again and will soon be put on display, an Italian museum director said Friday.

The mother of recently separated conjoined Bangladeshi twins does not want custody of the daughters she gave up for adoption and wants them to have new lives in Australia, newspapers reported Saturday.

The University of Nebraska's governing board on Friday voted not to place tighter restrictions on embryonic stem cell research than those outlined under federal guidelines, which were expanded after President Barack Obama took office.

Asian carp may have breached an electronic barrier designed to prevent the giant invaders from upsetting the ecosystem in the Great Lakes and jeopardizing a $7 billion sport fishery, officials said Friday.

A space shuttle is no tinker toy. But is it the most complex machine ever built?

A gigantic landslide that buried a highway, uprooted homes and rerouted a river in Washington state's Cascade Range left hundreds of smaller victims: fish.

A 20-foot-long crocodile with three sets of fangs -- like wild boar tusks -- roamed parts of northern Africa millions of years ago, researchers reported Thursday. While this fearsome creature hunted meat, not far away another newly found type of croc with a wide, flat snout like a pancake was fishing for food.