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April 1997

Volume 50, Issue 4

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Probing the Faintest Galaxies

Henry C. Ferguson, Robert E. Williams, and Lennox L. Cowie
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An explosion of data from the Hubble Space Telescope and large ground‐based telescopes is inspiring astronomers and helping to decipher the early history of the Universe.

Patent Basics for Physicists

A. James Richardson and Craig A. Wood
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In an age when scientific knowledge is increasingly being treated as a form of property, a general understanding of patents is becoming a necessity for the physicist.

Vortex Physics in High‐Temperature Superconductors

George W. Crabtree and David R. Nelson
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Our understanding of vortex matter in superconductors has grown dramatically in the last decade, creating new horizons in fundamental science and potential commercial applications.
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Physics Update

Phillip F. Schewe and Benjamin P. Stein
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Chemistry: Blithe Sibling of Physics

Dudley Herschbach
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Traditional versus Nontraditional Approaches to Introductory Physics Prove to Be a Textbook Case

Robert Jones, James M. Daniels, Robert Chasnov, Ruth W. Chabay, Bruce A. Sherwood, David J. Raymond, Alan M. Blyth, and Joseph Amato
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Cat Tales Reveal Footnotes to History that Give One Pause

Jack H. Hetherington, Robert J. von Gutfeld, William R. Hitchens, Theodor W. Hänsch, and Daniel Kleppner
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Model Needed for West Coast Freeway Traffic Doing the Wave

Michael C. Thusen
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Corrections

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Atomic Parity Experiment Has Its Moment

Barbara Goss Levi
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A group in Boulder, Colorado, has set a new record for precision in the measurement of an atomic transition that does not conserve parity. The experiment not only places constraints on the Standard Model of electroweak interactions but also provides evidence for the long‐predicted nuclear anapole moment.

HERA Groups Find Excess Deep Inelastic e+p Scattering Events

Gloria B. Lubkin
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Transient Stellar X‐Ray Sources Yield Evidence that Black Holes Really Do Have Event Horizons

Bertram Schwarzschild
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When we see a lot of mass crammed into a small enough space, general relativity tells us it has to be a black hole. But until now, we've never had direct evidence of an event horizon.

High‐Gain Avalanche Photodiode

Barbara Goss Levi
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A Physical Heritage of the Cold War: Excess Weapons Plutonium

Wolfgang K. H. Panofsky
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Physics: Calculus

Eugene Hecht, Amy J. Kolan, Reviewer, and Amy E. Larson, Reviewer
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Stalin's Captive: Nikolaus Riehl and the Soviet Race for the Bomb

Nikolaus Riehl, Frederick Seitz, and Alexei Kojevnikov, Reviewer
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Spiral Structure in Galaxies: A Density Wave Theory

Giuseppe Bertin, Chia‐Ch'iao Lin, and Bruce G. Elmegreen, Reviewer
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Peer Instruction: A User's Manual

Eric Mazur and Robert C. Hilborn, Reviewer
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Fragile Objects: Soft Matter, Hard Science, and the Thrill of Discovery

Pierre‐Gilles de Gennes, Jacques Badoz, and Michael Rubinstein, Reviewer
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New Books

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Focus on Microscopy

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Lawrence Awards Honor Work in Atomic Energy

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AGU Honors Eight in San Francisco

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Engineering Academy Names New Members

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In Brief

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FREE

Charles Palmer Bean

Ivar Giaever
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FREE

Gottfried Karl Wehner

Gerhard Betz and Peter Sigmund
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FREE

Walter Carl Beckham

Eugene H. Canfield, Arthur H. Guenther, and Clifford E. Rhoades, Jr
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New Lab Takes Molecular Approach to Nuclear Waste Cleanup

Toni Feder
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Puebla Site Chosen for Joint US–Mexican Radio Telescope

Toni Feder
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Interactive Journal Is Launched on the Web

Toni Feder
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In Brief

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Web Watch

Graham P. Collins
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Calendar

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