Notebook
- Math
Knot Views
Interested in playing around with some mathematical knots? Manuel Arala Chaves of the University of Porto in Portugal has created a table illustrating all 75 knots with up to 9 crossings in their standard representation. If your computer can handle LiveGraphics3D, you can manipulate the knots in three dimensions and look at them from different […]
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Issues of Medical Research
Should researchers be allowed to tinker with our genetic codes, or create copies of human beings? Could we somehow be harming future generations by aiding sick people today? Public Agenda Online offers a nonpartisan guide to these and other policy issues related to medical research. Go to: http://www.publicagenda.org/issues/frontdoor.cfm?issue_type=medical_research
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From the September 26, 1931, issue
FLASH WELDING JOINS METAL AMID SHOWER OF SPARKS A brilliant shower of sparks for a few seconds, and two pieces of steel have become one, with a union as strong as the original metal itself. The picture on the front cover from the Pittsfield, Mass., works of the General Electric Company illustrates a recent adaptation […]
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From the September 19, 1931, issue
ORCHIDS THAT LOOK LIKE GIRLS Plucked from their stems and stood on the table, they are the daintiest little dancers imaginable–dancers in the latest fashionable costumes at that. Their skirts are long and concealing, tight over the slim hips and flaring widely at the bottom. The dancers stand poised, their arms thrown up and out, […]
- Chemistry
Web Elements
Want to know more than just selenium’s symbol, atomic number, and atomic weight? Created by chemist Mark Winter of the University of Sheffield, WebElements provides information on each chemical element’s history, uses, reactions, bulk and thermal properties, and more. Go to: http://www.webelements.com/
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From the September 12, 1931 issue
ELEPHANTS JAWBONE SHOWS LIKENESS TO SCOOP SHOVEL Where the idea of the present-day scoop shovel came from is suggested in the illustration on the cover of this weeks Science News Letter. When President Henry Fairfield Osborn of the American Museum of Natural History received the weird lower jawbone of an ancient Asian elephant, he was […]
- Physics
Caught in a Flash
View the tip of a snapped towel (which moves faster than the speed of sound), then take a look at a bursting water balloon, a collapsing water drop, a tennis ball in mid-collision with a racket, and many other amazing images in this gallery of high-speed photos snapped by high school students. Sorry! This Web […]
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Human Cloning
Did you miss last month’s National Academy of Sciences workshop on scientific and medical aspects of human cloning? You can listen to the recorded presentations via RealPlayer (use the links at Workshop Agenda) and view the accompanying slides (see Speaker Presentations). Go to: http://www7.nationalacademies.org/COSEPUP/Workshop_Agenda.html –updated 8/26/03–VM.
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From the September 5, 1931, issue
SEEING EYE TO EYE WITH A WHITE WASP The medieval Japanese, who sometimes closed up the fronts of their helmets with ferocious metal masks painted with vivid war paint, knew the right psychology for hand-to-hand encounters. It is much more disconcerting to be confronted with an immobile, wholly artificial hobgoblin face than to see that […]
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From the August 29, 1931, issue
HUGE GENERATORS YIELD BEAUTY TO PHOTOGRAPHER Throbbing electric generators, the machines that are the heart of the great system supplying light and power to more than 120 millions, are odd and beautiful subjects for the talented photographer. In the picture on the cover, Rittase of Philadelphia has caught the spirit of one of the largest […]
- Tech
Reading Faces
Facial expressions can convey emotional nuances that words fail to communicate. Researcher Terrence Sejnowski has developed a computer program that analyzes images of human faces, purportedly matching the skills of professionals trained to read fleeting expressions of emotion. Learn more in an online article from the Howard Hughes Medical Institute’s HHMI Bulletin and at the […]
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Door to Antiquity
The Phimai temple complex in Thailand was an important Khmer economic, religious, and military center about 1,000 years ago. Richard M. Levy of the University of Calgary has created an elaborate computer reconstruction of this historic site, allowing visitors to wander the complex without traveling all the way to Thailand. Go to: http://www.phimai.ca/
