Lithuanian startup Tukas EV has developed an exercise bike that harnesses the energy you produce while peddling and stores it as a backup source of power for household devices and appliances. The exercise bike, dubbed HR Bank, was designed to provide urban dwellers with a reliable source of clean energy, but, perhaps more importantly, also for those in need of power during emergencies like natural disasters or wars. “Our idea was that a person who bought an HR bank could not only use it as an external battery, charged from the sun or the grid, but in the absence of…

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