Yellowstone is North America’s largest volcanic field, produced by a “hotspot” – a gigantic plume of hot and molten rock – that begins at least 400 miles beneath Earth’s surface and rises to 30 miles underground, where it widens to about 300 miles across.
Scientists using the largest cosmic ray observatory in the world, the Pierre Auger Observatory in Argentina, have made an important discovery about the highest-energy cosmic rays that hit the Earth - and the discovery leads back to supermassive black holes.
In Science, the Pierre Auger Collaboration announces that Active Galactic Nuclei - thought to be powered by supermassive black holes that devour large amounts of matter - are the most likely candidate for the source of the highest-energy cosmic rays that hit Earth.
The scientists found that the sources of the highest-energy particles are not distributed uniformly across the sky.
Certain varieties of common fescue lawn grass come equipped with their own natural broad-spectrum herbicide that inhibits the growth of weeds and other plants around them.
Cornell researchers have identified the herbicide as an amino acid called meta-tyrosine, or m-tyrosine, that these lawn grasses exude from their roots in large amounts. This amino acid is a close relative of para-tyrosine (p-tyrosine), one of the 20 common amino acids that form proteins.
Atmospheric scientists are just about the only group that doesn't have a crime drama on television but that may change. In every crime drama there needs to be a victim, in this case the atmosphere, and we might have a part-time criminal in ozone. There's even a pretty good name for the show - 'Windprofilers.'
Ozone is a colorless, toxic gas named for the Greek word for smell because of its pungent odor.
A new study led by researchers at The Miriam Hospital’s Weight Control & Diabetes Research Center finds that dieters who have the tendency to eat in response to external factors, such as at festive celebrations, have fewer problems with their weight loss than those who eat in response to internal factors such as emotions. The study also found that emotional eating was associated with weight regain in successful losers.
The study is published in the October 2007 issue of Obesity.
“We found that the more people report eating in response to thoughts and feelings, such as, ‘when I feel lonely, I console myself by eating,’ the less weight they lost in a behavioral weight loss program.
Statement of Anthony S. Fauci, M.D., director, National Institute of Allergy and Infectious Diseases:
The new analyses revealed today from the STEP HIV vaccine clinical trial are both disappointing and puzzling. At this time, the data offer no clear explanations as to why the vaccine showed no measurable efficacy or why among individuals with background immunity to the adenovirus vector, there were more HIV infections in the vaccinees as compared to those in the placebo group.