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Primordial Deuterium and the Big Bang

Nuclei of this hydrogen isotope formed in the first moments of the big bang. Their abundance offers clues to the early evolution of the universe and the nature of cosmic dark matter

By Craig J. Hogan

Daily Life in Ancient Egypt

Workmen and their families lived some 3,000 years ago in the village ow known as Deir el-Medina. Written records from the unusually well educated community off er fascinating descriptions of everyday activities

By Andrea G. McDowell

Creating Nanophase Materials

The properties of these ultrafine-grained substances, now found in a range of commercial products, can be custom-engineered

By Richard W. Siegel

Atmospheric Dust and Acid Rain

Emissions of acidic air pollutants have fallen dramatically. Why is acid rain still a problem? Atmospheric dust may be part of the answer

By Lars O. Hedin and Gene E. Likens

A Cricket Robot

Can a simple electromechanical system perform a complex behavior of a living creature? There was one sure way to find out

By Barbara Webb

The Specter of Biological Weapons

States and terrorists alike have shown a growing interest in germ warfare. More stringent arms-control efforts are needed to discourage attacks

By Leonard A. Cole


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