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Features

The Aging of the Human Species

Our species has modified the evolutionary forces that have always limited life expectancy. Policymakers must consequently prepare to meet the needs of a population that will soon be much older

By S. Jay Olshansky, Bruce A. Carnes and Christine K. Cassel

Listening with Two Ears

Studies of barn owls offer insight into just how the brain combines acoustic signals from two sides of the head into a single spatial perception

By Masakazu Konishi

Catalysis on Surfaces

Scientists can now observe how solids interact with individual molecules to speed reactions. Information about these catalysts is being used to improve everything from materials synthesis to pollution control

By Cynthia M. Friend

The Evolution of Virulence

Human behavior appears to influence whether pathogens evolve into benign or harmful forms. Health policy should therefore include evolutionary considerations

By Paul W. Ewald

Modern Humans in the Levant

Modern Homo sapiens preceded Neanderthals on Mount Carmel and followed a similar pattern of life for 60,000 years. Biology thus cannot explain the cultural revolution that then ensued

By Bernard Vandermeersch and Ofer Bar-Yosef

Concrete Solutions

By Gary Stix

Departments

  • Spot Marks the X

  • Cavity Quantum Electrodynamics

  • The Reproductive Behavior of the Stickleback

  • Book Reviews: Molecules at Work

  • Letters

    Letters to the Editors, April 1993

  • 50, 100 & 150 Years Ago

    50 And 100 Years Ago: Hertz Pioneers the First Phosphorescent Light

  • Profile

    The Nicest Guy in Washington

  • Mathematical Recreation

    The Rise and Fall of the Lunar M-pire

  • Science and the Citizen

    Obstacle Course

  • Easing a Financial Gag

  • An Eternally Self-Reproducing Cosmos?

  • Flat Chemistry

  • Kitty, We Shrunk Your Brain

  • Illuminating Zero

  • Ancient Sleepers

  • Asteroid Hunters

  • Departments

    Frequent Flaps in the Deregulated Skies

  • Scientists in the Movies

  • Technology and Business

    High Technology

  • Advertising Space

  • Virtuous Viruses

  • Light Motif

  • Putting the Brakes on Tankers

  • Global View

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April 1993

Think Outside the Gift Box