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“But we do have something we never had before: we have the added pressure of time. We can no longer wait around for the ideal opportunity. If we have not achieved our early dreams, we must either find new ones or see what we can salvage from the old. If we have accomplished what we set out to do in our youth, then we need not weep like Alexander the Great that we have no more worlds to conquer. There is clearly much left to be done, and whatever else we are going to do, we had better get on with it.”