Uncategorized
- Math
Perfect Pyramids
The tetrahedron is the simplest of all polyhedra—solids bounded by polygons. It has four triangular faces, four vertices, and six edges. If each edge has the same length and each face is an equilateral triangle, the result is a regular tetrahedron—one of the Platonic solids. Example of a tetrahedron. Another group of tetrahedra that some […]
- Math
Perfect Pyramids
The tetrahedron is the simplest of all polyhedra—solids bounded by polygons. It has four triangular faces, four vertices, and six edges. If each edge has the same length and each face is an equilateral triangle, the result is a regular tetrahedron—one of the Platonic solids. Example of a tetrahedron. Another group of tetrahedra that some […]
- Materials Science
Miniature Motor: Nanotubes central to new rotating device
Researchers have used miniature, nested cylinders, called multiwalled carbon nanotubes, to make a motor only 300 nanometers long.
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Beyond Clots: Platelets in blood may guide immune response
Platelets, best known for their ability to create blood clots in wounds, may also have a role in the immune system.
By John Travis - Astronomy
Taking the Crab’s pulse
Simultaneous recordings of a pulsar's radio emissions and its visible beam shed new light on the seemingly chaotic variations in the intensities of those emissions.
By Ben Harder - Tech
Press ‘n’ Peel Lasers: Coaxing light beams out of cheap plastic
Researchers have devised a way to imprint lasers in plastic—an achievement that may one day lead to ultracheap lasers mass-produced like poker chips.
By Peter Weiss - Astronomy
Sky Prospecting: Surveying the universe’s middle-aged galaxies
With a new sky survey, astronomers can tell the story of what happened during the universe’s middle years—about 7 billion years ago.
- Earth
Long-Term Ocean Venting: Seafloor system has been active for ages
Analyses of mineral deposits in and around a unique set of hydrothermal vents beneath the Atlantic Ocean suggest that the site's tallest towers of minerals have been growing for at least 30,000 years.
By Sid Perkins -
Giving Aid, Staying Alive: Elderly helpers have longevity advantage
Over a 5-year period, older people who offered a lot of social support to their spouses, friends, relatives, and neighbors displayed a lower mortality rate than seniors who gave little or no social support.
By Bruce Bower - Health & Medicine
Intestinal Fortitude: Treatment for colitis shows early success
Given as a drug, a protein fragment called epidermal growth factor induces remission in people with ulcerative colitis, apparently by healing intestinal lesions.
By Nathan Seppa - Health & Medicine
Promising drug cuts tumor metabolism
Early safety trials of an experimental medicine suggest that it could be used for treating several serious cancers.
By Ben Harder - Health & Medicine
Immune test predicts tolerance for radiation
A new blood test can foretell which cancer patients are likely to suffer serious delayed side effects from radiation therapy.
By Ben Harder