Black boxes: crucial to air crash probes

When investigators arrive at an aviation crash site, one of their first priorities is to locate the plane's black boxes, two pieces of equipment that can hold vital clues on what caused an aircraft to go down.

For nuclear weapons reduction, a way to verify without revealing

In past negotiations aimed at reducing the arsenals of the world's nuclear superpowers, chiefly the U.S. and Russia, a major sticking point has been the verification process: How do you prove that real bombs and nuclear devices—not ...

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