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Where did Modern Humans Originate?

The Recent African Genesis of Humans

Genetic studies reveal that an African woman of 200,000 years ago was our common ancestor

By Allan C. Wilson and Rebecca L. Cann

The Multiregional Evolution of Humans

Both fossil and genetic evidence argues that various human groups arose where they are found today

By Alan G. Thorne and Milford H. Wolpoff

Mountain Belts and the Supercontinent Cycle

Every 500 million years the continents assemble into a single landmass. The tectonic interactions associated with the formation and breakup of such supercontinents provide a new way to view the origin of mountain belts

By J. Brendan Murphy and R. Damian Nance

Superantigens in Human Disease

These proteins cause food poisoning and toxic shock. They may also contribute to arthritis and AIDS. Investigators are learning how superantigens overstimulate the immune system and induce disease

By Howard M. Johnson, Jeffry K. Russell and Carol H. Pontzer

The International Thermonuclear Experimental Reactor

This tokamak fusion reactor, sponsored by four industrial powers, will be the most powerful ever built. By fusing deuterium and tritium, ITER should generate more energy than it consumes

By Robert W. Conn, Valery A. Chuyanov, Nobuyuki Inoue and Donald R. Sweetman

Solid Acid Catalysts

Great progress has been made in the design of these important industrial materials. Some novel solid acid catalysts can reduce the emission of environmentally harmful products

By Sir John Meurig Thomas

Departments

  • 50 and 100 Years Ago: April 1992

  • Brain Drain

  • The Plankton Stalkers

  • First-Class Culprit

  • A Census of Stranglers

  • Vexing Vortices

  • D2 or not D2

  • A Second Glance

  • Fire in Water

  • Phantom Limbs

  • Hacking the Genome

  • Charlotte's Patent

  • Desktop Artisans

  • Avoiding the Potholes on Optical Highways

  • Waste Not...

  • Ballpark Physics

  • Helping the Little Guy Buy a Computer

  • Letters

    Errata

  • Letters to the Editors, April 1992

  • Recommended

    Book Reviews, April 1992

  • Mathematical Recreation

    All Paths Lead Away from Rome

  • Departments

    Compensation Beyond the Call of Duty

  • Essay: A Case of Dèjà Vu

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April 1992

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