In THE LONG EARTH by Terry Pratchett and Stephen Baxter, police officer Monica Jansson is exploring the burned-out home of a reclusive scientist who seems to have vanished. Sifting through the wreckage, Jansson finds a curious gadget: a box containing some rudimentary wiring, a three-way switch, and…a potato. It is the prototype of an invention that will change the way humankind views the world forever.
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