Uncategorized
- Math
Winning with a Winding Random Walk
A two-dimensional random walk takes a frustratingly long time to complete a circuit.
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- Humans
Explore Your Knowledge
Test your math and science knowledge at the National Center for Education Statistics Web site. Select a test topic and grade level (4th or 8th grade), then see how you do on a set of multiple-choice questions. The questions are from the Trends in International Mathematics and Science Study (TIMSS). Go to: http://nces.ed.gov/nceskids/eyk/
- Humans
Science’s New Guard: Winners of annual competition get honors and hefty scholarships
For her water-quality research project, an 18-year-old from Utah earned top honors among 40 competitors in the final phase of the annual Intel Science Talent Search.
- Materials Science
The art of the fold
With DNA origami, researchers can make complex nanostructures.
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19657
Unless the writer is deliberately implying an archaic theory of evolution in this article, the statement “Ultrasonic perception may have developed as the frogs (Amolops tormotus) struggled to hear each other . . .” cannot be true. That’s not how natural selection works. John WymoreAlbuquerque, N.M. Frogs that could hear frequencies higher than the water’s […]
- Animals
Can You Hear Me Now? Frogs in roaring streams use ultrasonic calls
A small frog living beside Chinese hot springs may be the first amphibian known to use ultrasound in its calls.
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Grown-Up Connections: Mice, monkeys remake brain links as adults
Two new studies offer a glimpse of extensive remodeling of nerve connections in the brain's outer layer, or cortex, during adulthood in mice and monkeys.
- Materials Science
Networking with Friends: Nanotech material reconnects severed neurons
A new material made of nanometer-sized protein particles appears to be able to bridge the gap between severed nerves.
- Earth
Shaken but Not Stirred: Rock formations reveal past quakes’ size limit
Dozens of precariously balanced rocks in southern California tell a consistent story that earthquakes at nearby faults in recent millennia haven't exceeded magnitude 7.
- Health & Medicine
Stent Repair: Coated replacements better than radiation
To clear clogged stents, the small mesh cylinders that doctors implant to prop open blood vessels, inserting a second, specially-coated stent works better than treatment with radiation.
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19656
This article states that the early universe expanded “from subatomic scales to the size of a grapefruit in less than a trillionth of a second” or one picosecond. This would correspond to a velocity many times the speed of light (light only travels about 0.012 inch in a picosecond). How can this statement be reconciled […]
