As part of efforts to understand drug abuse, researchers are finding that adolescent rats appear to be less vulnerable to the long-term effects of withdrawal and relapse in certain types of drug use than rats that take the drugs in adulthood.

A chemical reaction can occur in the blink of an eye. Thanks to a new analytical method, scientists can now pinpoint, at the millisecond level, what happens as harmful environmental contaminants such as arsenic begin to react with soil and water under various conditions.

Researchers have discovered an unusual kind of meteorite in the Western Australian desert and have uncovered where in the Solar System it came from, in a very rare finding.

A person, usually a child, dies of rabies every 20 minutes. However, only one inoculation may be all it takes for rabies vaccination, according to new research.

Three drugs that reduce a woman's chance of getting breast cancer also have been shown to cause adverse effects. This research is the first to make a direct, comprehensive comparison of drugs that reduce the risk of breast cancer so that women and their health-care providers can assess their potential effectiveness and adverse effects.

The composition of some of our nation's forests may be quite different 200 to 400 years from today according to a recent study. The study found that temperature and photosynthetic active radiation were the two most important variables in predicting what forest landscapes may look like in the future. The uncertainties became very high after the year 2200.

"Gut feelings" experienced by general practitioners (GPs) play a substantial role in their diagnostic reasoning process, but always in combination with analytical reasoning. Gut feelings can be separated into the sense of alarm and the sense of reassurance. Researchers worked with 27 medical opinion leaders to closely define the concepts, which will allow future research to evaluate the effectiveness of this "gut-compass."

Scientists are calling for urgent research to understand the impact of renewable energy developments on marine life. The study highlights potential environmental benefits and threats resulting from marine renewable energy, such as off-shore wind farms and wave and tidal energy conversion devices.

An innovative drug-delivery system -- nanoparticles encapsulating nitric oxide or prescription drugs -- shows promise for topical treatment of erectile dysfunction, according to a new study.

Tomorrow's lasers may come with a bit of bling, thanks to a new technology that uses man-made diamonds to enhance the power and capabilities of lasers. Researchers have now demonstrated the first laser built with diamonds that has comparable efficiency to lasers built with other materials.