Uncategorized
- Earth
Warm Spell: Arctic algae record shift in climate
Analyses of sediment samples taken from remote arctic lakes indicate that the climate across large swaths of the Northern Hemisphere has been warming for many decades.
- Health & Medicine
Measuring HIV’s Cost: Treatment adds years, but many still miss out
Medical care for people infected with HIV has already saved about 2 million years of life in the United States, but more than 200,000 HIV-infected Americans are not benefiting from drugs that could extend their lives.
- Physics
Brutal Bubbles: Collapsing orbs rip apart atoms
Spikes of heat and pressure in sonoluminescence caused by the implosions of light-emitting bubbles in liquids can strip atoms of electrons.
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19523
Your article didn’t specify how strong the ultrasonic waves were or if any special conditions were required for these bubbles to form. I am curious to know if there’s a difference between the ultrasonic waves mentioned in your article and those in ultrasound exams of pregnant women. Andrea BikfalvyDowagiac, Mich. The article made me wonder […]
- Humans
Letters from the March 5, 2005, issue of Science News
Way-up wander? It seems interesting that undersea flows have at least one characteristic different from rivers: “While river floods on land can create natural levees a few meters tall, the levees formed by [undersea] turbidity currents can grow up to 100 m[eters] high” (“Hidden Canyons,” SN: 1/1/05, p. 9). There are several sites on Mars […]
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- Health & Medicine
A Fishy Therapy
Shark cartilage continues to be sold to fight cancer, even though its efficacy has not been confirmed by any major U.S. trials.
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19522
I’m sure you published this article in good faith, but I believe that claims for shark cartilage are not made seriously by anyone who studies the role of natural substances in cancer prevention. It was proved ineffective long ago. I think your article does a disservice to honest people who are trying to fight the […]
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Cytoplasm affects embryonic development
The DNA in a fertilized egg's mitochondria may play a pivotal role in the organism's growth.
- Health & Medicine
Protein may aid stroke recovery
Tests in mice have shown that erythropoietin, a red blood cell growth factor, can reverse brain damage caused by strokes.
- Astronomy
Hole power
New computer simulations and observations are adding to the evidence that supermassive black holes control the growth of the galaxies they inhabit, wielding an influence far beyond their gravitational grasp.
- Archaeology
Pottery points to ‘mother culture’
The Olmec, a society that more than 3,000 years ago inhabited what is now Mexico's Gulf Coast, acted as a mother culture for communities located hundreds of miles away, according to a chemical analysis of pottery remains and local clays from ancient population sites in the area.
