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all they need is a box that can convert different electrical brain signals into digits (ie 1's and 0's).....it like converting analog signals to digital..they just gotta study what type of signals the brain produces with different feelings and see if it there is a common pattern on all humans....the idea is simple but of course probably harder to develop in real world situations, and of course there is the possibility of mistakes and if something goes wrong you could fry your brain....
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