Uncategorized
- Chemistry
Delivering the Goods
Experimental gene-delivery therapies generally use viruses to shuttle genetic material into cells, but some researchers are devising ways to avoid using the sometimes-risky viruses.
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19206
Your article has a picture of a “deer stone.” On it are engraved designs of reindeer that bear an astonishing resemblance to a tattoo borne by the 2,400-year old mummy discovered in 1993 in central Asia. Was this noticed by the researchers? Michelle BlanchardOlympia, Wash. Absolutely. William Fitzhugh, an expedition leader, says he was struck […]
- Anthropology
Southern Reindeer Folk
Western scientists make their first expeditions to Mongolia's Tsaatan people, herders who preserve the old ways at the southernmost rim of reindeer territory.
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19159
I read your article with great interest. There was a minor emergence of periodical cicadas this year in the area. However, despite what the article says, I don’t believe it was a brood emerging 4 years early. In 1983, 4 years before the last major emergence, there was a similar minor emergence. The 2000 emergence […]
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- Health & Medicine
Silencing a gene slows breast-tumor fighter
The protein encoded by the HOXA5 gene plays a key role in fighting breast cancer, helping to switch on cancer-suppressing genes.
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Hands, not eyes, hold clue to illusion
Psychologists disprove a leading hypothesis for the size-weight illusion—an error that arises when people try to estimate the weights of two bodies of different sizes but the same mass.
- Math
A Perfect Collaboration
It seems an unlikely pairing. One was the most prominent mathematician of antiquity, best known for his treatise on geometry, the Elements. The other was the most prolific mathematician in history, the man whom his eighteenth-century contemporaries called “analysis incarnate.” Together, Euclid of Alexandria (c325–c265 BC) and Leonard Euler (1707–1783), born in Switzerland and at […]
- Humans
From the January 14, 1933, issue
NEW TYPE OF ATOM-SMASHING GENERATOR NEARS COMPLETION The new type of electrostatic high-voltage generator being constructed by the Massachusetts Institute of Technology at Round Hill, Mass., with a Research Corporation grant will be in operation in a few weeks. Dr. R.J. Van de Graaff, its inventor, President Karl T. Compton of Massachusetts Institute of Technology, […]
- Humans
World Development News
SciDev.Net offers news, opinion, and information about science and technology, particularly those aspects that affect developing countries around the world. The Web site maintains extensive “dossiers” on such topics as research ethics, climate change, indigenous knowledge, genetically modified crops, and intellectual property, with more to come. Go to: http://www.scidev.net/
- Earth
Candid cameras catch rare Asian cats
Remote cameras have confirmed that despite 30 years of armed conflict, jungle cats and many other large mammals continue to thrive in Cambodia.
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Brain wiring depends on multifaceted gene
A single gene may produce 38,000 unique proteins that guide the growth of the developing brain.
