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How Many Species Inhabit the Earth?

The sad truth is that no one knows. The answer is relevant to efforts to conserve biological diversity and could illuminate crucial questions about evolution and management of the environment...

By Robert M. May

Quantum Cryptography

For ages, mathematicians have searched for a system that would allow two people to exchange messages in absolute secrecy. Quantum mechanics has now joined forces with cryptology to achieve a major step in that direction...

By Charles H. Bennett, Gilles Brassard and Artur K. Ekert

Mountain Sickness

The varied and subtle symptoms of this potentially lethal disorder humble many who scale the summits. But the problem is often preventable

By Charles S. Houston

Histones as Regulators of Genes

Histones were once dismissed as little more than packing material for nuclear DNA. In fact, these proteins can both repress and facilitate activation of many genes

By Michael Grunstein

Singing Caterpillars, Ants and Symbiosis

With siren songs and chemical lures, some butterfly caterpillars attract ants to serve as their guardians. Those same ants are usually involved in symbioses with other insects and plants as well...

By Philip J. DeVries

Diamond Film Semiconductors

Thin sheets of diamond, grown {rom a low-pressure gas and doped with impurities, may serve as the basis for a new generation of electronic devices

By Michael W. Geis and John C. Angus

Scavenging and Human Evolution

Although meat eating helped to shape the evolution of human brains, behavior and toolmaking, our early ancestors seem to have been better scavengers than hunters

By Robert J. Blumenschine and John A. Cavallo

Teaching Real Science

Educators are planning a revolution in science teaching. They face an uphill struggle.

By Tim Beardsley


  • Letters

    Letters to the Editors, October 1992

  • Recommended

    Book Reviews, October 1992

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: October 1992

  • Profile

    Illuminator of the Stars

  • Mathematical Recreation

    Murder at Ghastleigh Grange

  • Science and the Citizen

    The Edge of Chaos

  • The Best Little Yard Sale in New Mexico

  • Lying by the Book

  • Musseling In

  • Smart Wheels

  • Formula for Diabetes?

  • A Matter of Timing

  • The Cosmic Microwave Mirage?

  • Orphan Isotopes

  • Departments

    The Business of Education

  • Agenda 21: Sustainable Development

  • Technology and Business

    Storage Space

  • Different Strokes

  • Fine Grain

  • Billions of Buckytubes

  • Diagnosis by DNA

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