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Sputnik immediately captured the world's imagination with its beeps and its planetary shape, but it took days for the Soviet designers to realize the magnitude of their accomplishment.

A new study shows widespread testing for heart problems in young athletes helps prevent sudden cardiac deaths. But some say that screening every young athlete for a rare condition could cause more problems than it solves.

Before there was Bernie Madoff, there was Ivar Kreuger, the man John Kenneth Galbraith called the Leonardo of scammers. When Kreuger, an extremely successful and much-admired businessman during the 1920s, killed himself in 1932, investors discovered that his financial empire, based in the manufacture of matches, was made of sand, built out of complex financial instruments that are the forerunners of today's derivatives.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, discusses drug-resistant diseases. How common are they? How difficult are they to treat?

The new Lebanese film

Dith Pran documented — and experienced himself — the terror of Cambodia's brutal Khmer Rouge regime. Correspondent Sydney Schanberg reflects on a relationship with Pran chronicled in the 1984 Academy-award-winning film, The Killing Fields.

In the Muslim world, radicals, reformers, activists and academics are all struggling to reshape their religion. The debates often take place in cyberspace, or on Arabic-language satellite broadcasts. Some scholars say the debate is an "Islamic Reformation."

A former U.S. Marine and his Iraqi wife, who met when she worked as a translator in Fallujah, are struggling to adjust to married life and raise a family in America. And their future is anything but certain.

What can the U.S. military learn from the co-author of "Three Cups of Tea: One Man's Mission to Promote Peace, One School at a Time"? We speak to Greg Mortenson about the work he is doing with the military to build stronger relationships with community leaders in Afghanistan and Pakistan.

As Zimbabwe's economy collapses under 1,000 percent inflation, many of the people uprooted by a slum-clearance campaign last year remain homeless and unemployed. Human-rights activists in the Southern African nation say the country is on the verge of social upheaval.