Taking the stairs, taking a hike, taking a yoga class, or any other moderate physical activity recently helped thousands of healthy women maintain their weight for 13 years without cutting calories, a new study reports. The only catch is that it only worked for women with a normal body mass index (BMI) who exercised for an hour daily. [More]

Taking the stairs, taking a hike, taking a yoga class, or any other moderate physical activity recently helped thousands of healthy women maintain their weight for 13 years without cutting calories, a new study reports. The only catch is that it only worked for women with a normal body mass index (BMI) who exercised for an hour daily. [More]

Memory and thinking skills may decline rapidly for people who have mild cognitive impairment, which is the stage before Alzheimer's disease when people have mild memory problems but no dementia symptoms, and even more rapidly when dementia begins, which is when Alzheimer's disease is usually diagnosed.

A compound that can inhibit the transfer of HIV from one cell to another has been developed by researchers in France. It acts by saturating a receptor called DC-SIGN, which is used by HIV to ensure its transmission throughout the body.

Scientists have discovered three genes that could shed light on the genetic causes of blood-clotting disorders such as thrombosis and some types of stroke.

For centuries biologists have known that bird bones are hollow, and even elementary school children know that bird skeletons are lightweight to offset the high energy cost of flying. Nevertheless, many people are surprised to learn that bird skeletons do not actually weigh any less than the skeletons of similarly sized mammals. In other words, the skeleton of a two-ounce songbird weighs just as much as the skeleton of a two-ounce rodent.

Researchers are making improvements to semiconductor alloys that will help overcome some of the technical roadblocks to producing more effective photovoltaic cells for generating solar energy and will enable light-emitting diodes to provide more versatile and efficient lighting.

A team of researchers and clinicians has published the first proof that a targeted nanoparticle -- used as an experimental therapeutic and injected directly into a patient's bloodstream -- can traffic into tumors, deliver double-stranded small interfering RNAs, and turn off an important cancer gene using a mechanism known as RNA interference. Moreover, the team provided the first demonstration that this new type of therapy can make its way to human tumors in a dose-dependent fashion.

The most expensive wine ever sold in the U.S. was a Montrachet 1978 from Domaine de la Romanee-Cont, according to a report by Forbes.com. Following a bidding war between two avid collectors, the seven-bottle lot sold for a whopping $167,500 (almost $24,000 per bottle) in a 2001 auction at New York City's Sotheby's. [More]

Imagine if your fear of spiders, heights or flying could be cured with a simple injection. Research suggests that one day this could be a reality.