Individuals taking a medication to treat depression may experience changes in their personality separate from the alleviation of depressive symptoms, according to a new report.

A new study shows that people who have been infected with West Nile virus may have persistent virus in their kidneys for years after initial infection, potentially leading to kidney problems.

A new study on the surface chemistry of silver-colored, mercury-based dental fillings suggests that the surface forms of mercury may be less toxic than previously thought.

Neurology researchers have shown that feeding amino acids to brain-injured mice restores their cognitive abilities and may set the stage for the first effective treatment for cognitive impairments suffered by people with traumatic brain injuries. If these animal results can be translated to human medicine, there would be a broad clinical benefit. Every 23 seconds, a man, woman or child in the US suffers a traumatic brain injury.

Harnessing the power of "hot" electrons for solar energy has been held as a theoretical possibility. Now researchers report observing the hot electron effect in an ultra-thin solar cell for the first time and collecting the elusive charges, which are typically lost in less than one-trillionth of a second in traditional solar cells.

A galaxy located billions of light-years away is commanding the attention of NASA's Fermi Gamma-ray Space Telescope and astronomers around the globe. Thanks to a series of flares that began September 15, the galaxy is now the brightest source in the gamma-ray sky -- more than ten times brighter than it was in the summer.

We have all had the embarrassing experience of seeing an acquaintance in an unfamiliar setting. We know we know them but can't recall who they are. But with the correct cues from conversation or context, something seems to click and we can readily access very rich and vivid memories about the individual. Researchers have shed some light on this mysterious process, discovering that the hippocampus, a brain region in the temporal lobe, is only involved when cues enable us to recall these rich memories.

A new telescope -- VISTA (the Visible and Infrared Survey Telescope for Astronomy) -- has just started work at ESO's Paranal Observatory and has made its first release of pictures. VISTA is a survey telescope working at infrared wavelengths and is the world's largest telescope dedicated to mapping the sky. Spectacular new images of the Flame Nebula, the center of our Milky Way galaxy and the Fornax Galaxy Cluster show that it is working extremely well.

Men of all ages treated for prostate cancer with androgen deprivation therapy, specifically with gonadotropin-releasing hormone agonists, have an increased risk of diabetes and cardiovascular disease, according to a new study.

New information about lightning-emitted X-rays, gamma rays and high-energy electrons during thunderstorms is prompting scientists to raise concerns about the potential for airline passengers and crews to be exposed to harmful levels of radiation.