On the Cover
March-April 2009 Volume 97, Number 2
The first transistor was a relatively monstrous device, about half an
inch tall. Nowadays there can be up to a billion transistors on a tiny
silicon chip, and hundreds of chips are fabricated simultaneously on a
silicon wafer. ...
We’ve learned to predict typhoons. What is required to predict the floods they bring?
How to gamble if you must—the mathematics of optimal stopping
The basic unit of the computer revolution has changed in form, material and fabrication, but nothing has come along in half a century to displace it
A collection of decryption techniques and the analysis of various texts combine in the breaking of a 200-year-old code
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A review of Tools of American Mathematics Teaching, 1800–2000, by Peggy Aldrich Kidwell, Amy Ackerberg-Hastings and David Lindsay Roberts. This book surveys the “material culture” of the mathematics classroom: protractors, blocks, beads, geometric models, slide rules, calculators and the like
See all book reviews for this issue.