“Evolutionary theory tends to explain quite well in retrospect how various species emerged. It's not very good on prediction. Nevertheless, one cannot say that there isn't a lot of knowledge that's been obtained in this field. In the same way, with these complex physical phenomena between solid state physics, you can say a lot of things without necessarily knowing the next step.”
Quote by Kenneth Arrow
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Source: Make Gentle the Life of the World: The Vision of Robert F. Kennedy
“Unsolved problems, that's one of the great signs of progress in my opinion.”
