http://en.wikipedia.org/wiki/Jerome_Isaac_Friedman
http://www.brainyquote.com/quotes/authors/j/jerome_isaac_friedman.html
_ CE_2009. 8 ENG:SOSTENIBILIDAD ENERGÉTICA:
http://www.youtube.com/watch?v=CvkXDQe-x_k
_ Time Travel And Complexity
http://www.youtube.com/watch?v=XgHL0Es7msE
