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The Puzzle of Hypertension in African-Americans

Genes are often invoked to account for why high blood pressure is so common among African-Americans. Yet the rates are low in Africans. This discrepancy demonstrates how genes and the environment interact...

By Richard S. Cooper, Charles N. Rotimi and Ryk Ward

Light Sails

By Henry M. Harris

Air-Breathing Engines

By Charles R. McClinton

Highways of Light

By Leik N. Myrabo

Space Tethers

By Robert L. Forward and Robert P. Hoyt

Compact Nuclear Rockets

By James R. Powell

The Way to Go in Space

To go farther into space, humans will first have to figure out how to get there cheaply and more efficiently. Ideas are not in short supply

By Tim Beardsley

High Blood Pressure and the Slave Trade

Reaching for the Stars

By Stephanie D. Leifer

Supersoft X-ray Stars and Supernovae

Several years ago astronomers came across a new type of star that spews out unusually low energy x-rays. These so-called supersoft sources are now thought to be white dwarf stars that cannibalize their stellar companions and then, in many cases, explode...

By Peter Kahabka, Edward P. J. van den Heuvel and Saul A. Rappaport

Cichlids of the Rift Lakes

The extraordinary diversity of cichlid fishes challenges entrenched ideas of how quickly new species can arise

By Melanie L. J. Stiassny and Axel Meyer

A Multifractal Walk down Wall Street

The geometry that describes the shape of coastlines and the patterns of galaxies also elucidates how stock prices soar and plummet

By Benoit B. Mandelbrot

How Limbs Develop

A protein playfully named Sonic hedgehog is one of the long-sought factors that dictate the pattern of limb development

By Robert D. Riddle and Clifford J. Tabin


  • From the Editor

    Worm Gets the Early Bird

  • Letters


  • Erratum

  • Recommended

    Reviews: The Narrative of Numbers

  • Reviews: The Narrative of Numbers

  • Anti Gravity

    This is only a Test

  • 50, 100 & 150 Years Ago

    50, 100 and 150 Years Ago: Research Money, Panama Canal, and New Whaling Ground

  • Wonders

    Noah's Flood?

  • Profile

    Bones to Pick

  • Mathematical Recreation

    Origami Tessellations

  • Amateur Scientist

    Tackling the Triple Point

  • Science and the Citizen

    Attack of the Fire Ants

  • Taming Maxwell's Demon

  • By the Numbers

    Tranquility, Turmoil and Chaos for International Business

  • Working Knowledge

    Working Knowledge on Giant Crawler Cranes

  • Cyber View

    Private Parts

  • Technology and Business

    Not Cleaning Up

  • A Laser in Tune With Itself

  • Breath of Fresh Liquid

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