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3,585 results
3,585 results for: assessments
- Tech
CD players could serve as cheap lab tools
Ordinary CD disc players can be adapted to perform chemical assays and possibly medical diagnoses.
- Anthropology
Not So Clear-Cut: Soil erosion may not have led to Mayan downfall
Hand-planted maize, beans, and squash sustained the Mayans for millennia, until their culture collapsed about 1,100 years ago. Some researchers have suggested that the Mayans’ very success in turning forests into farmland led to soil erosion that made farming increasingly difficult and eventually caused their downfall. But a new study of ancient lake sediments has […]
- Earth
Clay That Kills: Ground yields antibacterial agents
A special type of French clay smothers a diverse array of bacteria, including antibiotic-resistant strains and a particularly nasty pathogen that causes skin ulcers.
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Crime Growth: Early mental ills fuel young-adult offending
Mental disorders in children can lead to criminal behavior in adulthood.
- Health & Medicine
Calculated Risk: Shedding light on fracture hazards in elderly
Diminished bone density in elderly people contributes to fractures following traumatic accidents.
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Furry Math: Macaques can do sums like people in a hurry
Macaques and college students showed similarities in performance on a computer test of split-second arithmetic, suggesting a common inheritance of the ability to do approximate math without counting.
- Humans
An earlier thaw can trim winter logging
In New Hampshire, the trend toward earlier spring thaws has significantly lowered logging revenues.
- Earth
No-drive experiment curbs air pollution in Beijing
Traffic-control measures can significantly reduce urban air pollution, a field study in Beijing this past summer indicates.
- Paleontology
Life explodes twice
The Ediacaran fauna were as varied as all animals in existence today and, more impressively, as in the Cambrian, report paleontologists.
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9/11 attacks stoked U.S. heart ailments
People who experienced serious stress reactions shortly after the September 11, 2001, terrorist attacks also displayed markedly elevated rates of new heart and blood vessel ailments over the next 3 years.
- Health & Medicine
Pot Downer: Marijuana users risk gum disease
Regular marijuana smoking is linked to gum disease in young adults.
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New World Stopover: People may have entered the Americas in stages
People first reached the edge of the Americas about 40,000 years ago but had to stay put for at least 20,000 years before melting ice sheets allowed them to move south and settle the rest of the continent.
