The smoke from the twin bombs at the Boston Marathon yesterday contains clues about the explosives used to construct them.
Credit: David L. Ryan/The Boston Globe via Getty Images
As a team of investigators led by the FBI begins deciphering the bombs that killed three people and wounded 150 more in Boston this week, a key clue is already in plain sight on countless videos taken during the blasts: the color of the smoke.
From Wired
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