800w, 1200w, 1920w" alt="One gram of hair can produce three blocks of the growth medium (right), each one measuring 1.5 x 1.5 x 3 cm (0.6 x 0.6 x 1.2 in)" />

As compared to traditional agriculture, hydroponic farming uses less space and less water, plus it requires no soil. It still does require a growth medium, though – and scientists have recently created a better such medium, derived from discarded human hair.

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Category: Science

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