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On the Cover

July-August 1999 Volume 87, Number 4

Recent ice- and ocean sediment-core studies have revealed that the average global atmospheric temperature has changed as much as 10 degrees Celsius in less than 20 years. In "Rapid Climate Change," Kendrick Taylor reviews the evidence for such changes and raises the question of whether greenhouse-induced warming may precipitate a return to an ice-age climate. ...


FEATURE ARTICLES

Rapid Climate Change

Kendrick Taylor

New evidence shows that earth's climate can change dramatically in only a decade. Could greenhouse gases flip that switch?


Human Embryonic Stem-Cell Research: Science and Ethics *

Shirley Wright

A discovery that could revolutionize medicine raises the question of where to draw the line on human embryonic research


The Mystery of Ticklish Laughter *

Christine Harris

Pleasure or pain? Social response or reflex? Tickling and the laughter it induces are an enigmatic aspect of our primate heritage


Polarized Starlight and the Handedness of Life *

Stuart Clark

The asymmetry of the amino acid molecules found in all living things may have originated in space billions of years ago


DNA Vaccines as Cancer Treatment *

Edwin F. de Zoeten, Edward Cohen, Morton Schatzman

No longer limited to warding against infectious agents, vaccines may help treat diseases after they have been diagnosed


* access restricted to members and subscribers


SCIENTISTS’ BOOKSHELF

Behind Das Iron Curtain

Alexander Gurshtein

A review of Science under Socialism: East Germany in Comparative Perspective, edited by Kristie Macrakis and Dieter Hoffman.

See all book reviews for this issue.


DEPARTMENTS

COMPUTING SCIENCE

The Vibonacci Numbers

Brian Hayes

Variations on a familiar theme

MARGINALIA

Pulse, Pump & Probe

Roald Hoffmann

Capturing the vanishingly brief

ENGINEERING

Drawing Bridges *

Henry Petroski

Washington D.C.'s Woodrow Wilson Memorial Bridge

SCIENCE OBSERVER

Tornado Rising

Dana Mackenzie

The dangers of "nondescending" twisters

Fusion from Television?

David Schneider

Tabletop nuclear fusion gets a second look

Stardust Memories

Michael Szpir

Chemistry probes the secrets of extrasolar dust grains

Archimedes Unbound

William Cannon

New life for an ancient Greek palimpsest

FROM THE PRESIDENT


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