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Mersul pe jos face bine sanatatii, dar cine stie daca nu poate chiar sa aduca beneficii mediului inconjurator. Cercetatorii de la Universitatea din Michigan au experimentat eficacitatea unui nou dispozitiv, foarte asemanator unei genunchiere, in masura sa produca electricitate folosind caldura provocata de miscarea gambelor. Aparatul se activeaza in mod automat atunci cand genunchiul nu se mai misca, tocmai in acel moment “recoltand” energia cinetica acumulata, care altminteri s-ar pierde. Cu cate un dispozitiv amplasat pe ambii genunchi, in timpul experimentului, fiecare voluntar a generat 5 wati, suficienti pentru a alimenta zece telefoane mobile deodata. Alergand, un om ar putea genera pana la 54 wati, dar costul acestui efort nu a fost deocamdata cuantificat.
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