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Two years ago, scientists at the National Center for Atmospheric Research in Boulder, Colo., released a study claiming that inconsistencies between satellite observations of Earth's heat and measurements of ocean heating amounted to evidence of "missing energy" in the planet's system.

Scientists may one day slow down aging with a simple injection of youthful stem cells. They’ve just proven this can be done in mice, according to a study published Tuesday in Nature Communications. The mice, which had been engineered to mimic a human disease called progeria, would normally have grown old when they were quite young. But that changed when researchers injected muscle stem cells from healthy young mice into the bellies of the quickly aging mice. Within days, the doddering and frail mice began to act like they were living the storyline of “The Strange Case of Benjamin Button” as they started looking and acting younger.

A prestigious scientific journal is retracting a controversial 2009 report that linked chronic fatigue syndrome to a virus.

For the clueless or cynical diehards who deny global warming, it’s getting awfully cold out there. The latest icy blast of reality comes from an eminent scientist whom the climate-change skeptics once lauded as one of their own. Richard Muller, a respected physicist at the University of California, Berkeley, used to dismiss alarmist climate research as being “polluted by political and activist frenzy.” Frustrated at what he considered shoddy science, Muller launched his own comprehensive study to set the record straight. Instead, the record set him straight.

Scientists have found a direct link between the number of "friends" a person has on Facebook and the size of certain brain regions, raising the possibility that using online social networks might change our brains.

Many of Earth's species appear to be shrinking in size, a new study reports, and its authors think that's probably due to global warming.

One reason optimists retain a positive outlook on life despite all evidence to the contrary has been discovered, say researchers. A study, published in Nature Neuroscience, suggests the brain is very good at processing good news about the future. However, in some people, anything negative is practically ignored - with them retaining a positive world view.

Mayo Clinic researchers have developed a genome-based immunization strategy to fight feline AIDS and illuminate ways to combat human HIV/AIDS and other diseases. The goal is to create cats with intrinsic immunity to the feline AIDS virus.

Scientists are reporting the first clear success with a new approach for treating leukemia - turning the patients' own blood cells into assassins that hunt and destroy their cancer cells....

A team of scientists has reported producing viable sperm using the stem cells of mice in an experiment that researchers hope could one day lead to treating infertile men....