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It doesn't have to be people. Have you considered using crabs? https://phys.org/news/2012-04-scientists-crab-powered.html https://phys.org/news/2012-04-scientis
by leshokunin 7y ago
It doesn't have to be people. Have you considered using crabs? https://phys.org/news/2012-04-scientists-crab-powered.html https://phys.org/news/2012-04-scientists-crab-powered.html