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September-October 2000 Volume 88, Number 5

Ideas about the proton have evolved considerably since Rutherford first identified this subatomic particle in the second decade of the 20th century. In "The Search for QCD Exotics," Alex R. Dzierba, Curtis A. Meyer and Eric S. Swanson explain that theorists realized in the 1960s that the proton contains three elementary subunits—dubbed quarks. ...

FEATURE ARTICLES

Brain Plasticity and Recovery from Stroke *

R?diger J. Seitz, Nina Azari

What has changed in the brain of a stroke patient who recovers the ability to move a once-disabled limb?

A New Urban Ecology *

James Collins, Ann Kinzig, Nancy Grimm, William Fagan, Diane Hope, Jianguo Wu, Elizabeth Borer

Modeling human communities as integral parts of ecosystems poses special problems for the development and testing of ecological theory

The Search for QCD Exotics

Alex Dzierba, Curtis Meyer, Eric Swanson

Particles predicted by the theory of quantum chromodynamics help explain why the fundamental building blocks of matter are impossible to isolate

Pollination of Cacti in the Sonoran Desert *

Theodore Fleming

When closely related species vie for scarce resources, necessity is the mother of some pretty unusual evolutionary inventions

Andrew Ellicott Douglass and the Big Trees *

The Giant Sequoia was fundamental to the development of the science of dendrochronology—tree-ring dating

* access restricted to members and subscribers

SCIENTISTS’ BOOKSHELF

Fuel Cell Start-Up

A review of Powering the Future: The Ballard Fuel Cell and the Race to Change the World, by Tom Koppel.

See all book reviews for this issue.

DEPARTMENTS

COMPUTING SCIENCE

The World in a Spin

The Ising model, mapping a universe mathematically

MARGINALIA

In Search of Better Skies: Harvard in Peru I

J. Donald Fernie

Establishing an observatory in 19th-century South America

ENGINEERING

Concrete Canoes *

These unlikely watercraft are not only seaworthy, they're raceable

SCIENCE OBSERVER

Journey to the Center of the Earth

David Schneider

How fast is the Earth's inner core spinning?

Flash Upon a Neutron Star

Innovative movies make an x-ray burst visible

All Cells Lead to Rome

Michelle Hoffman

Patriotic pancreas cells form a map of Italy

Two Hearts Beat as One

Rebecca Sloan Slotnick

A shattered heart is united during embryonic development

Acts of Nutrition

Testing nutritious rice varieties in a Philippine convent

Twisting at Tahoe

David Schneider

A lucky meteorologist spots six waterspouts in one day

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