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Features

The Artistry of Microorganisms

Colonies of bacteria or amoebas form complex patterns that blur the boundary between life and nonlife

By Eshel Ben-Jacob and Herbert Levine

Secrets of the Slime Hag

Loathsome though they may seem, hagfishes may also resemble the earliest animals to have a braincase--making them even older than the first animals to develop a backbone

By Frederic H. Martini

Galaxies behind the Milky Way

Over a fifth of the universe is hidden from view, blocked by dust and stars in the disk of our galaxy. But over the past few years,

By Renée C. Kraan-Korteweg and Ofer Lahav

Firewalls

Three types of safeguards offer a formidable defense against Internet intruders

By William Cheswick

Designer Estrogens

These compounds--also called SERMs-- have evolved from mere laboratory curiosities into drugs that hold promise for preventing several major disorders in women

By V. Craig Jordan

Cryptography for the Internet

E-mail and other information sent electronically are like digital postcards--they afford little privacy. Well-designed cryptography systems can ensure the secrecy of such transmissions

By Philip R. Zimmermann

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