"America has been erased like a blackboard, only to be rebuilt and then erased again. But baseball has marked time while America has rolled by like a procession of steamrollers."

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What would happen if history could be rewritten as casually as erasing a blackboard? Our past would be like the shifting sands at the seashore, constantly blown this way or that by the slightest breeze. History would be constantly changing every time someone spun the dial of a time machine and blundered his or her way into the past. History, as we know it, would be impossible. It would cease to exist.

— Michio Kaku