These spiky metal balls are nano dimensions and held held in a special polymer so they do not touch one another. Them come in a pill size. They are used as pressure sensors. They utilize quantum tunneling: without pressure, the conductive elements are too far apart to conduct electricity; when pressure is applied, they move closer and electrons can tunnel through the insulator.
jpr: You can buy one for 28c but they are made in England and available in Canada only this side of the "pond".
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