"There is not ultimate breakthrough; what we find in the development of a creative life is an open-ended series of provisional breakthroughs. In this journey there is no endpoint, because it is the journey into the soul."

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Energy is very primal stuff and there are a lot of leads that are promising, still at a fairly risky stage, but over the next decade some of these breakthrough approaches are going to pay out, and U.S. research and U.S. leadership on this should be part of how it gets solved.

— Bill Gates