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In 1951, a pair of scientists at Cornell discovered time-travel. With the specter of the atomic bomb in the immediate background, they decide not to replicate Einstein's mistake of suggesting what might be a weapon to the political authorities. Instead, they decide to set up a clandestine research program, swearing all those who work on it to keep the secret.
Then, in 1991, a time traveler returns from 2031 with a disturbing message: no traveler and no message has ever come farther back fro...