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Fly on the wall! Defense Advanced Research Projects Agency is working to develop cyborg insects that carry spy equipment. To make the insects as inconspicuous as possible, miniaturized brain probes are inserted during the pupa stage. The idea
Spy Gear for Kids - invisible ink from lemon juice, finger prints from charcoal. We are going to take their finger prints to use in a matching game later in the evening. The Boy Scouts site had a great page for fingerprinting.