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Contents of the September/October 1995 issue of Quantum
 Feature
articles
Dragon Curves
by Nikolay Vasilyev and Victor Gutenmacher
A look at the intriguing figures found by Chandler Davis and Donald Knuth and the
mathematics behind them.
On the Nature of Space Magnetism
by Alexander Ruzmaykin
Untangling the turbulent source of the “hydromagnetic dynamo”in outer space.
Educated Guesses
by John Adam
An amusing collection of so-called “Fermi problems”(order-of-magnitude
estimates).
Clarity, Reality, and the Art of Photography
by Mark L. Biermann
How “depth of field” affects the blurriness—intentional or not—in
photographs.
Departments
At the Blackboard: The Quadratic
by Vladimir Boltyansky
A refresher course in this staple of the high school curriculum.
In the Lab: A tell-tale trail and a chemical clock
by N. Paravyan
Two simple experiments with alternating current.
Follow-up: Life on an Accelerating Skateboard
by Albert A. Bartlett
What was wrong with figure 1 in the March/April Physics Contestproblem? And what is
“weight” anyway?
Kaleidoscope: All Bent out of Shape
A look at the many forms of deformation.
Physics Contest: Split Image
by Arthur Eisenkraft and Larry D. Kirkpatrick
What happens to an image when you slice a lens in two?
Math Investigations: Problems Beget Problems
by George Berzsenyi
A review of readers’ replies, including a visit from a Quantumfounding
editor.
Toy Store: Winning Strategies
by Vladimir Dubrovsky
Detailed solutions to the game problems offered in the July/AugustKaleidoscope.
How Do You Figure?: Challenges in Physics and Math
Brainteasers: Just for the Fun of It!
Check out this sample!
Happenings
Crisscross Science
Scientific crossword puzzle.
Answers, Hints & Solutions
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