Synaptics' prototype pad had a grid of electrodes running across a board.

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Neither GM nor Toyota is developing an exclusively electric vehicle, but both are scrambling to develop vehicles that run for long stretches on electricity sucked from the grid, but with on-board gasoline-powered motors for backup.

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The custom-made "Metric Mystery" board is divided into a grid of 36 squares, Brendon told his rapt audience.

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