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Contents of the July/August 1995 issue of Quantum


Feature articles

Bubbles in Puddles

by Alexander Mitrofanov

A physicist muses on the shape, size, and longevity of the bubbles that form during a heavy rainfall.


Knots, Links, and Their Polynomials

by Alexey Sosinsky

A continuation of an article in the January/February 1995 issue, this article explores the ins and outs of knot theory.


True on the Face of It

by Gordon Moyer

A clockwork counterproof of Zeno’s paradox allows Achilles to defeat the tortoise in the legendary footrace.


Number Systems

by Isaak Yaglom

If you think the decimal system is the only way to go, think again—there’s more than one way to tally up a total.


Departments

At the Blackboard I: Circuits and Symmetry

by Gary Haardeng-Pedersen

Using symmetry to cut down on the algebra.


Mathematical Surprises: Dr. Matrix on the Wonders of 8

by Martin Gardner

A visit from the (late?) great numerologist.


In the Lab: Canopies and Bottom-flowing Streams

by Ivan Vorobyov

Physics in a spoonful of water.


At the Blackboard II: Irregular Regular Polygons

by Eric D. Carlson and Sheldon L. Glashow

An investigation instigated by a dictionary definition.


Looking Back: The Giants

by Vladimir Belonuchkin

The persons Newton meant when he said, “If I have seen farther than others, it is because I have stood on the shoulders of giants.”


Kaleidoscope: Lazy-day Antidotes

by Anatoly Savin

Fun problems to quicken your mind on a hazy summer day.


Physics Contest: Pins and Spin

by Arthur Eisenkraft and Larry D. Kirkpatrick

A bowling problem with the emphasis on the ball’s “English.”


Math Investigations: Revisiting Napoleon’s Theorem

by George Berzsenyi

In addition to an interesting problem, an invitation to visit the Geometry Forum.


Toy Store: A Party of Wise Guys

by Anatoly Kalinin

A report from the 14th International Puzzle Party.


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


Index (1994–95)


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