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On the Cover

July-August 2003 Volume 91, Number 4

American-born artist William Utermohlen, diagnosed with Alzheimer's disease in 1996, has chronicled the resulting emotional turmoil, and physical and mental decline, in a series of evocative self-portraits. The cover image, entitled "Mask (white)," was made around the time of his diagnosis. ...


FEATURE ARTICLES

Conserving Biodiversity Coldspots *

Peter Kareiva, Michelle Marvier

Recent calls to direct conservation funding to the world's biodiversity hotspots may be bad investment advice


Ice at the Lunar Poles

Richard Vondrak, Dana Crider

That the Moon harbors ice at high latitudes is well known. The source of that water, however, may come as something of a surprise


Alzheimer's Disease

Vernon Ingram

The molecular origins of the disease are coming to light, suggesting several novel therapies


The Value of Positive Emotions *

Barbara Fredrickson

The emerging science of positive psychology is coming to understand why it's good to feel good


Quantum Erasure *

Marcelo O. Terra Cunha, Sebastio Padua, Stephen Walborn, Carlos Monken

In quantum mechanics, there are two sides to every story, but only one can be seen at a time. Experiments show that "erasing" one allows the other to appear


* access restricted to members and subscribers


SCIENTISTS’ BOOKSHELF

Making Connections

Prabhakar Raghavan

A review of Six Degrees: The Science of a Connected Age, by Duncan J. Watts.

See all book reviews for this issue.


DEPARTMENTS

COMPUTING SCIENCE

The Spectrum of Riemannium

Brian Hayes

Brian Hayes traces an intriguing link between number theory and nuclear physics

MACROSCOPE

Wilderness

Thomas Eisner

Thomas Eisner on the glories of un-landscaping

SIGHTINGS

At the Breaking Point

Felice Frankel

When does a drip drop? Physicist Sid Nagel knows—and has captured the moment on film

MARGINALIA

Cats and Rats

Roald Hoffmann

Roald Hoffmann on catnip, clover and a chemical clue to Stalin's death

ENGINEERING

Floating Bridges *

Henry Petroski

Henry Petroski looks into the innovative practice of pontoon bridge design

FROM THE PRESIDENT


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