Scientific American Magazine Vol 264 Issue 4

Scientific American Magazine

Volume 264, Issue 4

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Features

The Real Cost of Energy

Bringing market prices in line with energy's hidden burdens will be one of the great challenges of the coming decades

Harold M. Hubbard

The Structure of Quasicrystals

Quasicrystals are neither uniformly ordered like crystals nor amorphous like glasses. Many features of quasicrystals can be explained, but their atomic structure remains a mystery

Peter W. Stephens, Alan I. Goldman

Molecular Zippers in Gene Regulation

Recurring copies of the amino acid leucine in proteins can serve as teeth that "Zip" two protein molecules together. Such zippering plays a role in turning genes on and off

Steven Lanier McKnight

Collisionless Shock Waves

To many theorists' surprise, shock waves form even in the rarefied material between the planets. These shocks sculpt the space environment and lie at the heart of a variety of astrophysical phenomena

Roald Z. Sagdeev, Charles F. Kennel

Hepatitis B Virus

This small, extraordinary virus causes liver diseases and a common form of cancer. New vaccines produced by genetic engineering hold the promise of eventually eradicating both

Pierre Tiollais, Marie-Annick Buendia

Photochromic and Photosensitive Glass

Unlike ordinary glass, these glasses respond to light, resulting in structures that find uses in electronics, optics and the decorative arts

Donald M. Trotter Jr.

How Dinosaurs Ran

Did the giants of the Mesozoic period lumber sluggishly, or were they formidable running machines? Techniques borrowed from modern physics and engineering may give us the answer

R. McNeill Alexander

Hard Words

How deeply can language be traced? Radical linguists look back to the Stone Age. Traditionalists disagree.

Philip E. Ross

Departments

Letters to the Editors, April 1991

Errata

Erratum

50 and 100 Years Ago: April 1991

Cold Start

Tracking the Missing Carbon

Seeking Senescence

A Gentler Therapy?

Into the Lattice

Looking for Nothing

Old Masters

A Press Release on Dioxin Sets the Record Wrong

History Lessons

Political Engineer

Love and Terror

A Plague of Plaques

Is Morse Code Signing off?

Call and Tell

Gas Vaccine

Mind Reader

The Analytical Economist - April, 1991

Mathematical Recreations, April 1991

Books, April 1991

America' Green Strategy