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?
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
The Nuclear Threat
A look at strike capabilities worldwide, and how a bomb would affect single cities and people.
The Great Cosmic Roller-Coaster Ride
Could cosmic inflation be a sign that our universe is embedded in a far vaster realm
Playing Defense against Lou Gehrig's Disease
Researchers have proposed potential therapies for a paralyzing disorder once thought to be untreatable
Nuclear Weapons in a New World
Countries are altering their nuclear arsenals, prompting the U.S. to refurbish its own warheads
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
Blood Cells for Sale
There's more to blood banking than just bagging blood
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