uber e a economia do "bico" http://www.latimes.com/opinion/topoftheticket/la-na-tt-uber-economy-20160516-story.html
armazenando energia em trens e pedras: https://www.wired.com/2016/05/forget-elons-batteries-fix-grid-rock-filled-train-hill/?mbid=social_twitter
acompanhe esses links recomendados por aqui: http://usina.com/u/pocket
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