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 Comet Holmes: The Great Silver Celestial Jellyfish
Bob Townsend
This is a photograph of the Great Silver Celestial Jellyfish (aka comet Holmes) that I made on 8 December 2007. The image is twenty-one 60-second subs with my Takahashi E200 and Canon 350D DSLR combined in Images Plus. I did only 60-second exposures, so it wouldn't be necessary to use the tracking telescope. This was a totally unguided shot. |
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Leaving Science: Occupational Exit from Scientific Careers
Anne E. Preston, Russell Sade Foundation, New York, 2004, 201 pages.
ISBN: 0-87154-694-9
Reviewed by Michael Reed
Anne E. Preston is associate professor of economics at Haverford College, Pennsylvania. In Leaving Science, Prof. Preston describes some of the reasons why people leave their careers and majors in science for other fields, such as medicine and law.
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To Knot or Not?
How to generate and identify random knots in a piece of string.
Dorian M. Raymer
What governs the annoying formation of random knots in strings, cords, and garden hoses? Mathematicians have studied knots for more than a century, but only in the abstract. As physicists, we have also found this to be an interesting physics problem.
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How to Build the "Weaver’s Puzzle"
Mike Reilly with Jenks Norwalk
The object of this puzzle is to weave the string from pin to pin, touching each pin only once, and then have the string reach and, without excess length, be able to place the last pin in its designated target hole.
Please read all these instructions before you begin and assemble all your materials like you would for a recipe (I love to cook!). Pay special attention to instruction number Seven!
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A Droplet Puzzle
Kevin Kilty
On a recent morning I stepped out of my house to greet the day, and noticed two droplets that had fallen from my rain gutter onto the table on the porch.
One droplet is about 3 mm high and 10 mm in diameter, and the other is 3 mm in diameter and 1 mm high. Around each is a nearly perfectly circular splatter, yet each droplet has pulled back into a dome-shaped bead of water that sits at or near the center of the splatter.
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This Week at Hilton Pond
Bill Hilton Jr.
Executive Director
Hilton Pond Center for Piedmont Natural History
York, South Carolina 29745 USA
The Importance of Water (22-30 November 2007)
The current lack or rain has us thinking a lot about the importance of water for birds and other wildlife, as well as the human penchant for wasting this valuable natural resource.
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