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The Ulysses Mission

The first space probe to be sent on a polar trajectory has made some remarkable discoveries on its first orbit around the sun

By Edward J. Smith and Richard G. Marsden

The Placebo Effect

Colds, asthma, high blood pressure and heart disease are among the many conditions that can respond to treatment with a placebo.

By Walter A. Brown

The Architecture of Life

A universal set of building rules seems to guide the design of organic structures -- from simple carbon compounds to complex cells and tissues

By Donald E. Ingber

Picosecond Ultrasonics

Brief pulses of high-frequency sound allow experimenters to probe connections inside a computer chip

By Humphrey Maris

Lise Meitner and the Discovery of Nuclear Fission

One of the discoverers of fission in 1938, Meitner was at the time overlooked by the Nobel judges. Racial persecution, fear and opportunism combined to obscure her contributions

By Ruth Lewin Sime

Leonardo and the Invention of the Wheellock

Leonardo da Vinci's notebooks are full of inventions, from intricate gun parts to bicycles to automobiles. But were any of Leonardo's many creations actually made during his lifetime?

By Vernard Foley

Bacterial Gene Swapping in Nature

Genes travel between independent bacteria more often than once was assumed. Study ofthat process can help limit the risks of releasing genetically engineered microbes into the environment

By Robert V. Miller

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