Women buy shampoos that promise “silky smoothness.” Men buy the same “dandruff protection” shampoos. Advertisers have known ““ men and women are different. For decades, scientists have attributed these differences to sex hormones, but a new study by UCLA scientists suggests that gender identity is hardwired into the brain long before sex hormones are even developed. Read more...

An 11-year near-total ban on silicone-gel breast implants may soon come to an end following the recommendation of a Food and Drug Administration advisory board that their sale resume, although subject to strict conditions. Read more...

After suffering through horrible sinus pain, Marjorie Broder was almost incapable of going on with her daily life ““ until she met Dr. Ka-Kit Hui. Battling terrible headaches, Broder consulted every specialist in town for two years. Read more...

Early in the summer, the United States Anti-Doping Agency sent Dr. Don Catlin a used syringe. The needle was given to the USADA by an anonymous “high profile” track and field coach concerned that athletes might be using a mysterious performance-enhancing drug. Read more...

In a move to increase national security without impeding scientific growth, a panel of scientists put together a report urging another tier of prior review for proposed experiments that could be used by terrorists or hostile nations to make biological weapons. Read more...

The National Institutes of Health awarded the UCLA Stroke Center a $16 million grant earlier this month to be used in the clinical trial of a new treatment for acute strokes. Read more...

There are two certainties of living in Los Angeles: traffic and air pollution. Though it seems there will be no immediate end to the traffic, hybrid vehicles powered by gas and compressed air may reduce smog levels. Read more...