Backward time travel will never be developed and used extensively by human beings at any time in the future.

Page 107, Exercise #9: Backward time travel will never be developed and used extensively by human beings at any time in the future.

Page 107, Exercise #9: Backward time travel will never be developed and used extensively by human beings at any time in the future. For, if backward time travel were to be developed and used extensively, then travelers from the future would be likely to v

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