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GENEVA - The world's largest atom smasher made another leap forward Monday by circulating beams of protons in opposite directions at the same time and causing the first particle collisions in the $10 billion machine after more than a year of repairs, organizers said.

NEW ORLEANS - 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 child's never-ending "why's" aren't meant to exasperate parents, scientists say. Rather, the kiddy queries are genuine attempts at getting at the truth, and tots respond better to some answers than others.

CAPE CANAVERAL, Fla. - A pair of astronauts zipped through the third and final spacewalk of their mission Monday, helping to install a 1,200-pound oxygen tank at the International Space Station and accomplishing everything else on their list.

If you experience impotence, instead of a little blue pill maybe you want to apply shockwaves to your privates instead.

HARRISBURG, Pa. - Radioactive dust unexpectedly blew out of a pipe being cut by workers during weekend maintenance at the Three Mile Island nuclear power plant, and officials on Monday were trying to determine exactly how and why it happened.

GENEVA (AFP) - Flooding in the world's major port cities caused by melting icecaps could cause up to 28 trillion dollars (18 trillion euros) in damage in 2050, environmental group WWF said in a report Monday.

WASHINGTON (AFP) - Thousands of animal species thrive in the ocean depths beyond the reach of sunlight, between 200 to 5,000 meters below the surface, an international team of scientists has reported after nearly 10 years of research.

BOULDER, Colo. – Call it Operation: Plymouth Rock. A plan to send a crew of astronauts to an asteroid is gaining momentum, both within NASA and industry circles.

NATRONA, Pa. - The federal government and the Allegheny County Health Department have sued Allegheny Ludlum Corp. and a contractor for alleged air pollution violations at a slag dump near Pittsburgh.

Two astronauts raced through the second spacewalk of their docked shuttle mission at the International Space Station Saturday, getting so far ahead of schedule they took on jobs scheduled for future excursions.

WASHINGTON - 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.

MAUNA LOA OBSERVATORY, Hawaii - The readings at this 2-mile-high station show an upward curve as the world counts down to climate talks: Global warming gases have built up to record levels in the atmosphere, from emissions that match scientists' worst-case scenarios.

Several lines of evidence point to the possibility of a past ocean on Mars, from apparent ancient shorelines to chemicals in the soil.

One of the best annual meteor showers will peak in the pre-dawn hours Tuesday, and for some skywatchers the show could be quite impressive.

GENEVA (AFP) - Greenhouse gas emissions have kept increasing, reaching a record level since the pre-industrial era, the UN climate agency warned Monday, just weeks before a crucial climate change summit.

WASHINGTON (Reuters) - Federal officials are investigating a radiation leak at Three Mile Island, scene of the worst U.S. nuclear power accident, but said on Sunday there was no threat to public health or safety.

Texting long messages can be a pain in the neck - literally.

The deep sea is teeming with thousands of species that have never known sunlight, explorers now say.