Uncategorized
- Math
Divisibility by Seven
An ingenious, recently developed method tests if a number is divisible by 7.
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Cockroach Study
For students and teachers, this Web page by high school biology teacher Mary Colvard offers a lesson plan for a lab in which students look for signs of learning in cockroaches. The lesson plan includes background information about cockroaches. Go to: http://www.accessexcellence.org/AE/AEC/AEF/1995/colvard_cockroach.html
- Humans
Letters from the May 21, 2005, issue of Science News
Rascal rabbits Evidence of animals sensing where people are looking and what they’re seeing is interesting yet hardly new (“Monkey See, Monkey Think: Grape thefts instigate debate on primate’s mind,” SN: 3/12/05, p. 163). For years, I have observed that wild rabbits will remain motionless as long as I stare in their direction. But as […]
- Humans
From the May 18, 1935, issue
Making heavy water, probing the cause of multiple sclerosis, and establishing galaxy rotation.
- Physics
Molecular Anatomy Revealed
Using ever-faster lasers to zap the electron clouds in atoms and molecules, scientists are making major strides toward observing and controlling the elementary quantum transformations that underlie all of chemistry.
- Earth
Muddy Waters
Even though human activities such as agriculture and deforestation are sending more sediment into streams and rivers, less of that material is reaching river deltas, a trend that exacerbates problems such as subsidence and coastal erosion.
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19552
This article, on the deleterious effect of dams on coastal systems, contains a major conceptual error. It states that “another important cause of the ground sinking is the waning of sediment deposition by the Mississippi River.” But over the past 100 million years, the northern Gulf Coast region has been subsiding because of excessive sediment […]
- Chemistry
Boxes coated with citronella repel insects
A fragrant grass extract known as citronella oil may deter insects from infesting cartons of food.
- Earth
School buses spew pollution into young lungs
Children riding on school buses inhale heavy doses of diesel fumes, and reducing these emissions could be a cost-effective means of improving their health, a new study suggests.
- Anthropology
Coasting to Asia in the Stone Age
New genetic analyses of people from native island groups in Southeast Asia support the unconventional view that around 70,000 years ago, people living in Africa crossed the Red Sea and moved east along Asia's southern coast.
- Planetary Science
Saturnian moonscape
Planetary scientists have obtained their closest image yet of Epimetheus, one of Saturn's tiny moons.
- Health & Medicine
Insulin may trigger type 1 diabetes
Insulin itself may precipitate the body's autoimmune attack in people with type 1 diabetes.
