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One of the challenges of the 21st century is creating a sustainable economy that is able to serve the needs of a growing population with the decreasing supply of natural resources. In addition to alternative energy sources, renewable economy

I don't feel frightened by not knowing things, by being lost in a mysterious universe without having any purpose - which is the way it really is so far as I can tell - it does not frighten me.–Richard Feynman, The Pleasure of Finding Things