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Contents of the September/October 1998 issue of Quantum


Feature articles

Rigidity of Convex Polyhedrons

by N. P. Dolbilin

Why a flexible polyhedron must be convex.

Rigidity
Art by Vasily Vlasov

Flexible Polyhedral Surfaces

by V. A. Alexandrov

Do closed, flexible polyhedrons (without self-intersections) exist?


Why Don’t Planes Fly with Cats and Dogs?

by V. Mescheryakov

Two friends contemplate the physics behind their flight delay.


Euclidean Complications

by I. Sabitov

What’s true locally according to Euclid may not remain valid as we travel afield.


Sound Power

by O. V. Rudenko and V. O. Cherkezyan

The nature and uses of intense acoustic waves.


Departments

Kaleidoscope: Do You Really Know Vapors?

“It’s not just the heat—it’s the humidity.” What physical facts underlie this common summertime refrain?


Physics Contest: Up, Up and Away

by Larry D. Kirkpatrick and Arthur Eisenkraft

Fire up your hot-air balloon and rise to the challenge.


At the Blackboard I: High-speed Conservation

by A. Korzhuyev

Tackling problems dealing with bodies moving at near the speed of light.


At the Blackboard II: Auxiliary Polynomials

by L. D. Kurlyandchik and S. V. Fomin

Constructing helper equations is sometimes the best way to get to the root of the problem.


At the Blackboard III: In Focus

by A. Dozorov

A sharp glance at the optics of eyesight.


In the Lab: Magnetic Fieldwork

by D. Tselykh

How to measure the energy stored in a magnetic field.


Musings: I Can See Clearly Now

by David Arns

A poem.


Cowculations: Fly Zapper

by Dr. Mu

Dr. Mu pilots an ultralight plane to zap black flies with bolts from the blue.


How Do You Figure?: Challenges in Physics and Math


Brainteasers: Just for the Fun of It!

Check out this sample!


Crisscross Science

Scientific crossword puzzle.


Feedback

Thoughts from our readers.


Happenings

Bulletin Board.


Answers, Hints & Solutions


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