el descontento es la primera necesidad del progreso
thomas edison
http://www.slideshare.net/zamanthag/listas-1668353
http://www.chesniuk.com.ar/php/lab_div/m1b.pdf
http://www.juntadeandalucia.es/averroes/iesgaviota/fisiqui/practicasq/node2.html
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