Nano-based weapons could include tiny drones that deliver poisons to targets without being detected, nanobots that enter the body in water or as an aerosol and tear it apart from within, or systems that selectively target certain groups of people of any description.[42] As nanotechnology pioneer Eric Drexler wrote in 1986, “ ‘Plants’ with ‘leaves’ no more efficient than today’s solar cells could out-compete real plants, crowding the biosphere with an inedible foliage. Tough, omnivorous ‘bacteria’ could out-compete real bacteria: they could spread like blowing pollen, replicate swiftly, and
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