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Features

Cell Defenses and the Sunshine Vitamin

Scientists now recognize that vitamin D does much more than build strong bones and that many people are not getting enough of it. Is widespread D deficiency contributing to major illnesses?

By Luz E. Tavera-Mendoza and John H. White

The Science of Doing Good

Information technology, satellite imaging and research carried out in disaster-relief areas have begun to transform humanitarian aid into a more efficient and less haphazard endeavor

By Sheri Fink

Brilliant Displays

A new technology that mimics the way nature gives bright color to butterfly wings can make cell phone displays clearly legible, even in the sun's glare

By M. Mitchell Waldrop

A Need for New Warheads?

The U.S. government's proposal to build the first new nuclear warhead in two decades raises a host of questions

By David Biello

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