For the first time, scientists have improved hearing in deaf animals by using human embryonic stem cells, an encouraging step for someday treating people with certain hearing disorders.

"It's a dynamite study (and) a significant leap forward," said one expert familiar with the work, Dr. Lawrence Lustig of the University of California, San Francisco.

The Mars rover Curiosity is preparing to roll again after it completes its health checkups this week, project managers said Wednesday.

Since landing in an ancient crater near the Martian equator Aug. 5, the car-size rover has trekked more than the length of a football field, leaving wheel tracks in the soil that could be spied from space.

International conservation groups have unveiled a list of the earth's most threatened 100 animals, plants and fungi and say urgent action is needed to protect them.

The groups identified the species Tuesday in a report presented to a global conservation forum on the southern South Korean island of Jeju.

The European Space Agency is exploring the possibility of cooperating with China on manned space missions by the end of the decade.

The head of ESA's human spaceflight division says some European astronauts are already learning Chinese in preparation for joint missions.

Scientists have discovered well-preserved frozen woolly mammoth fragments deep in Siberia that may contain living cells, edging a tad closer to the "Jurassic Park" possibility of cloning a prehistoric animal, the mission's organizer said Tuesday.

Russia's North-Eastern Federal University said an international team of researchers had discovered mammoth hair, soft tissues and bone marrow some 328 feet (100 meters) underground during a summer expedition in the northeastern province of Yakutia.

A rapidly worsening water shortage threatens to destabilize the planet and should be a top priority for the U.N. Security Council and world leaders, a panel of experts said in a report Monday.

The world's diminishing water supply carries serious security, development and social risks, and could adversely affect global health, energy stores and food supplies, said the report titled "The Global Water Crisis: Addressing an Urgent Security Issue."

There's enough wind to power the world many times over, according to a study out Monday, but it would take a massive infrastructure investment to harness it that analysts say is not realistic.

As the world seeks to lessen its reliance on fossil fuels like coal and natural gas, renewable energy sources like wind and solar power are being developed as alternatives.

U.S. researchers have uncovered part of what's happening, on a cellular level, to make cocaine addicts going cold turkey feel so bloody awful, according to a study published Monday.

The results provide a better understanding of what's creating that crashing low of withdrawal -- and may offer a clue for researchers looking to mitigate the symptoms and keep the user from relapsing.

The announcement two months ago that physicists have discovered a particle consistent with the famous Higgs boson cleared a formal hurdle on Monday with publication in a peer-reviewed journal.

Two laboratories working at the European Organization for Nuclear Research (CERN) had jointly announced on July 4 they had detected a new fundamental particle in experiments at the Large Hadron Collider near Geneva.

India's national space organization has marked its 100th mission by launching French and Japanese satellites.

The Indian Space Research Organization said Sunday's launch of a French observation satellite and a Japanese microsatellite was a success.