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In 1993, Israeli physicist Moti Milgrom showed an adjustment to the way gravity is calculated that would make dark matter go away in Newton’s system for calculating gravity. If Milgrom’s math were used in the survey for dark matter in your article, would it also make dark matter go away? O. Frank TurnerWestminster Colo. Most […]
- Astronomy
Cosmic Survey: Galaxy map reveals dark business as usual
The most precise map of how galaxies cluster, pulled together by the tug of gravity, has confirmed that most of the cosmos is in the dark, consisting of 5 percent ordinary matter, 25 percent dark matter, and 70 percent dark energy.
- Earth
Flaming Out? Days may be numbered for two fire retardants
The maker of two controversial flame-retardant chemicals has voluntarily initiated negotiations with the federal government to end their production.
- Health & Medicine
Hormones in Your Milk
Four dairies got their proverbial hands slapped by the U.S. Food and Drug Administration for marketing what it charges is “misbranded” milk. The regulatory agency recently issued warning letters to the companies–which sell whole milk, reduced-fat milk, and ice cream–saying that their product labels contain false statements about the food’s hormone status. USDA FDA’s Sept. […]
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- Earth
California acts on plastic additive
Korean engineers have developed a replacement for a plasticizer used in polyvinyl chloride that California has just ruled is a known reproductive toxicant.
- Physics
New type of material that heat can’t bloat
A newfound material exhibits the desirable property of not expanding when heated over a wide temperature range, but from an apparent cause never seen before—electrons changing positions inside the new compound's crystal structure.
- Health & Medicine
Cancer drug might fight Alzheimer’s
Tests in animals show that the cancer drug imatinib mesylate, also called Gleevec, slows formation of the kinds of plaques found in the brains of Alzheimer's patients.
- Chemistry
Clays catalyze life?
Clay minerals at the bottom of the ocean may have played a crucial role in assembling the very first cells on Earth billions of years ago.
- Physics
Shedding Light on the Infrared
For students and teachers, this NASA-sponsored Web site offers illuminating insights into infrared light. It explains the fundamentals of infrared astronomy, using animations, images, classroom lessons and activities, games, and more. Take a look at infrared views of familiar objects, from Yellowstone’s “Old Faithful” geyser to a pot-bellied pig. Go to: http://coolcosmos.ipac.caltech.edu/
- Paleontology
Ancient atmosphere was productive
New laboratory experiments suggest that extra carbon dioxide in the atmosphere in the era just before the dinosaurs went extinct may have boosted plant productivity to at least three times that found in today’s ecosystems.
- Paleontology
Healed scars tag T. rex as predator
Healed wounds on the fossil skull of a Triceratops—wounds that match the size and shape of those that would be made by Tyrannosaurus rex—are a strong sign that the tooth scrapes are a result of attempted predation, not scavenging.
