Uncategorized
- Health & Medicine
Panel ups RDAs for some antioxidants
An Institute of Medicine panel reported that dietary antioxidants such as vitamins A and E can limit cellular damage from free radicals but warned that studies in people have never adequately established a direct connection between antioxidant consumption and prevention of chronic disease.
- Tech
Ribbon to the Stars
Advances in one of the tiniest of technologies—carbon nanotubes—is bringing the concept of a space elevator closer to reality.
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A Man’s Job
Sperm contain an unexpected payload of RNA, a discovery offering insight into infertility, cloning, and contraception.
- Animals
Music without Borders
When birds trill and whales woo-oo, we call it singing. Are we serious?
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Colossal study shows amphibian woes
The largest amphibian data set ever crunched—936 populations in 37 countries—confirms global declines.
- Archaeology
Early New World Settlers Rise in East
New evidence supports the view that people occupied a site in coastal Virginia at least 15,000 years ago.
- Humans
From the October 1, 1932, issue
WARNING SPOTS OR TARGETS? Eye-spots, like those on the wings of the Cecropia moth on the front cover, are commonly interpreted either as warning markings, to scare off enemies, or as “targets” to draw the enemy’s attention to a non-vital spot. But moths get eaten anyway.–(Photo by Cornelia Clarke). COSMIC RAYS BOMBARD EARTH WITH 40,000 […]
- Tech
Cool Contraptions
The J. Paul Getty Museum’s intriguing online exhibition, “Devices of Wonder,” features optical devices, robots, thinking machines, and other fanciful contrivances of yesteryear. Check out a variety of ingenious contraptions for projecting images, playing music, revealing secrets, and more. Go to: http://www.getty.edu/art/exhibitions/devices/choice.html
- Humans
From the April 12, 1930, issue
MEDICAL WORLD HONORS DR. WELCH While the whole medical world united in honoring Dr. William Henry Welch on his 80th birthday on April 8, and the president of the United States delivered an address at the Washington celebration, few outside the world of science know who Dr. Welch is or why he was honored in […]
- Physics
Interacting with Physics
Drag an electric charge to see how it affects a nearby water molecule. Fool around with a laser to cool an atom. The University of Colorado’s Physics 2000 Web site relies heavily on interactive animations to demonstrate important concepts and discoveries in modern physics. Topics range from X rays and CAT scans to the quantum […]
- Health & Medicine
Gene expression helps classify cancers
Using gene chips to study the activity of thousands of genes simultaneously, researchers showed that a common cancer of white blood cells—diffuse large B-cell lymphoma—is in fact two distinct diseases.
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19144
Why am I not surprised that the pH of lung moisture decreases during an asthma attack? Poor ventilation of the alveoli would retain carbon dioxide, which is carbonic acid in solution. Does the change in pH correspond to a buildup of carbonate or bicarbonate in the blood? Would it be a better measure of an […]
