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" As part of the animal sentinel program, going back to 1999, scientists had been making great progress training honeybees to locate bombs. Bees have sensing capabilities that outperform the dog’s nose by a trillion parts per second. Using Pavlovian techniques, scientists cooled down groups of bees in a refrigerator, then strapped them into tiny boxes using masking tape, leaving their heads, and most of their antennae, poking out the top. Using a sugar water reward system, the scientists trained the bees to use their tongues to “sniff out” explosives, resulting in a reaction the scientists call a “purr.” After training, when the scientists exposed the bees to a six-second burst of explosives, some had learned to “purr. "

Annie Jacobsen , The Pentagon's Brain: An Uncensored History of DARPA, America's Top-Secret Military Research Agency


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Annie Jacobsen quote : As part of the animal sentinel program, going back to 1999, scientists had been making great progress training honeybees to locate bombs. Bees have sensing capabilities that outperform the dog’s nose by a trillion parts per second. Using Pavlovian techniques, scientists cooled down groups of bees in a refrigerator, then strapped them into tiny boxes using masking tape, leaving their heads, and most of their antennae, poking out the top. Using a sugar water reward system, the scientists trained the bees to use their tongues to “sniff out” explosives, resulting in a reaction the scientists call a “purr.” After training, when the scientists exposed the bees to a six-second burst of explosives, some had learned to “purr.