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Gray Goo is often envisioned as an entity made up of trillions upon trillions of nanites that work as a single predatory sentience (though not necessarily sapience) - growing continually in mass as it breaks down all other matter at a sub-atomic level, adding what remains into itself and forming a gigantic wave of "Gray Goo" that will ultimately engulf the entire planet, extinguishing all life save for the Gray Goo itself.