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How do we know it was really Osama bin Laden? The DNA test explained.

A forensic DNA test has provided '99.9 percent certainty' that Osama bin Laden was killed in Pakistan on Sunday. How does that work, exactly?
Scientists use 'trinitite' from 1945 to help decode nuclear blasts

Samples taken from the US site of the Trinity atomic bomb test allow scientists to better understand how to track the source of a detonated nuclear weapon.
Maryland earthquake shakes up nation's capital

Maryland earthquake, measuring 3.6 magnitude, was centered just outside Washington, D.C. just after 5 AM ET Friday.
Rightsizing your retirement

As the stock market sags, retirement savers must revisit their long-term options.
Horse racing moves to reform, but faces many skeptics

A new overseer, Tommy Thompson, promises to be tough on doping and other questionable practices.
Language Weaver: fast in translation

How one firm quickly translates reams of data.
Millions of snow geese imperil fragile ecosystem

Far-northern breeding grounds are devastated. A major culprit: expanded farming in US Midwest.
Olympic torch protests chagrin many Chinese-Americans

In San Francisco's Chinatown, support for the torch relay Wednesday has more to do with cultural pride than political concerns.