The synthetic form of progesterone most commonly prescribed for postmenopausal hormone replacement therapy in the United States may erase the therapy's intended heart benefits.
A light-sensitive molecule made by a saltwater bacterium could form the basis of an optical computer.
The level of neural activity in a specific part of the cortex seems to signal whether medication will lift a depressed person's mood.
Discovery of a dust disk orbiting two stars could double the estimate of planets in the galaxy.
Observation of an excess of high-energy positron-proton collisions in which a positron rebounds with an enormous amount of momentum suggests the existence of particles or forces outside of conventional theory.
A week after the announcement that a sheep had been cloned from adult cells, Oregon scientists performed a similar feat in monkeys using cells from embryos.
A newly discovered gene encodes a protein used by some cells to convert food calories to heat, an energy-consuming mechanism that some researchers speculate may be sluggish in obese people.
Inhaled steroids effectively relieve asthma, but prolonged, high-dose use markedly increases an elderly person's risk of glaucoma.
The earliest flying vertebrate broke new biological ground when it constructed wings.
Chemists have built a tough synthetic protein based on clues provided by microorganisms thriving in near-boiling water on the ocean floor.
Like Frankenstein's monster, a working enzyme can be constructed by stitching together parts.
After they become infected, immune cells of some people may be able to prevent certain strains of the HIV virus from reproducing.
A version of a gene recently associated with the aging process may increase a person's heart attack risk.
By March 20, Comet Hale-Bopp should become a naked-eye spectacle in the northwestern sky just after twilight.
Earthquakes are nudging the North Pole toward Tokyo.
Cooling of the eastern tropical Pacific has delayed global warming.
Computers are helping to search texts and data now shrouded in linguistic differences
With a little help, computers can retrieve foreign texts or data and display it in another's mother tongue.
Scientists are putting postage-stamp-size DNA chips to an incredible variety of uses, including the detection of genetic mutations, the diagnosis of infectious disease, and the monitoring of activity inside cells.
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