Time travel used to be thought of as just science fiction but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out.
Every known fact in natural science was divined by the presentiment of somebody before it was actually verified.
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It seems to me that socialists today can preserve their position in academic economics merely by the pretense that the differences are entirely moral questions about which science cannot decide.
