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Bomb Sniffer: Cantilevers detect trace amounts of explosives

Plastic explosives are difficult to detect because a bomb maker can mold them into concealable or inconspicuous objects. Consider shoe bombs. Existing technologies for sensing explosives are bulky and expensive. Now, however, researchers have fabricated a cheap sensor that can detect the barest whiff of these materials in the air and do so in a matter of seconds.

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