Scientific American

August 2000

Volume 283

Number 2

COVER STORY

Is Global Warming Harmful to Health?

Paul R. Epstein

Computer models indicate that many diseases will surge as the earth's atmosphere heats up. Signs of the predicted troubles are already appearing in some regions.

Number 2

Volume 283

The Universe's Unseen Dimensions

Nima Arkani-Hamed, Savas Dimopoulos and Georgi Dvali

Our whole universe may sit on a membrane floating in a higher-dimensional space. Extra dimensions might explain why gravity is so weak and could be the key to unifying all the forces of nature.

How Green Are Green Plastics? Tillman U. Gerngross and Steven C. Slater

It is technologically possible to make plastics using green plants rather than nonrenewable fossil fuels. Yet these new plastics may not be the environmental saviors researchers have hoped for.

Fountains of Youth: 42

Early Days in the Life of a Star Thomas P. Ray

Peering into the genesis of stars and planets, the Hubble Space Telescope and other instruments have found that it is a frenetic process, violently expelling vast jets of material.

Form from Fire 58

Arvind Varma

In combustion synthesis, a fast-moving wave of flame transforms loose piles of powder into useful materials. These ultraquick reactions can now be watched.

Male Sexual Circuitry Irwin Goldstein and the Working Group for the Study of Central Mechanisms in Erectile Dysfunction

Control of what goes on below the belt starts inside men's heads.

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