New research uncovers a case of mistaken identity that may have a significant impact on future breast cancer prevention and treatment strategies. The study, published by Cell Press in the September 3rd issue of the journal Cell Stem Cell, suggests that despite their "stem cell-like" characteristics, most aggressive breast tumors are not derived from normal mammary gland stem cells.

New research from the University of New Hampshire shows that the "gateway effect" of marijuana – that teenagers who use marijuana are more likely to move on to harder illicit drugs as young adults – is overblown.

A study led by researchers in the Oregon Health & Science University Smoking Cessation Center may change the way clinicians make treatment decisions for their patients who smoke.

'Mindfulness', the process of learning to become more aware of our ongoing experiences, increases well-being in adolescent boys, a new study reports.

Patients with asthma who are exposed to violence in their community are at an increased risk for an asthma-related hospitalization and emergency room visits for asthma or any cause, according to new research from the University Of Pennsylvania School of Medicine.

Spanish researchers have calculated the probability of dying in road accidents on the basis of the time taken for the emergency services to arrive. Their conclusions are clear – reducing the time between an accident taking place and the arrival of the emergency services from 25 to 15 minutes would cut the risk of death by one-third.

One of the most difficult aspects of working at the nanoscale is actually seeing the object being worked on. Biological structures like viruses, which are smaller than the wavelength of light, are invisible to standard optical microscopes and difficult to capture in their native form with other imaging techniques.

Providing body armor to all law enforcement officers in the United States would provide enough benefit to justify the cost, according to a new RAND Corporation study.