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On the Cover

May-June 2001 Volume 89, Number 3

En route to their spawning grounds, chum salmon battle the falls of the McNeil River, about 400 kilometers southwest of Anchorage, Alaska. Chum and the six other salmonid species inhabiting the Pacific Northwest face growing threats to their survival as development of the region expands. ...


FEATURE ARTICLES

Probing Gas Hydrate Deposits *

Robert Kleinberg, Peter Brewer

Immense quantities of natural gas can be found in icy gas-hydrate deposits. But exploiting this unconventional energy source will be a great challenge


Preserving Salmon Biodiversity

Phillip Levin, Michael Schiewe

The number of Pacific salmon has declined dramatically. But the loss of genetic diversity may be a bigger problem


Alfalfa

Michael Russelle

After an 8,000-year journey, the "Queen of Forages" stands poised to enjoy renewed popularity


Combing Chromosomes *

John Herrick, Aaron Bensimon

Extending DNA and labeling specific sequences pinpoints chromosomal features and unravels natural and disease processes


How Were the Comets Made?

Joseph A. Nuth III

Explaining the composition of these 4.5 billion-year-old relics may require scientists to revise their models of the primitive solar nebula


* access restricted to members and subscribers


SCIENTISTS’ BOOKSHELF

Waiting to Take You Away

Tim Royappa

A review of A Chemical History Tour: Picturing Chemistry from Alchemy to Modern Molecular Science, by Arthur Greenberg.

See all book reviews for this issue.


DEPARTMENTS

COMPUTING SCIENCE

Computing Comes to Life

Brian Hayes

How to build a computer out of E. coli

MACROSCOPE

Population Growth, Technology and Tricky Graphs

Peter Schulze, Jack Mealy

Debunking a popular view of human population growth

MARGINALIA

Vestiges of James Hutton

Keith Stewart Thomson

The pioneering geologist's view of earthly origins

ENGINEERING

China Journal I *

Henry Petroski

A journey to the building site of the world's largest hydroelectric plant

SCIENCE OBSERVER

Bart Bok's Black Blobs

Michael Szpir

Molecular clouds and the birth of stars

A Sine on the Road to Mecca

Dana Mackenzie

Ancient Muslim methods for finding the "sacred direction" for prayer

The Armpit of the Avian World

Rebecca Sloan Slotnick

Do cowbirds check out their own colors in order to identify prospective mates?

FROM THE PRESIDENT


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