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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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