How do we know time-travelers aren’t constantly changing the past?
June 2, 2012
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wonders movie website i09 here. They give seven reasons how we can know this. 1) Time travel is impossible. 2) Even if it were possible, you couldn’t change the past. 3) You might only be able to travel back as far as the point where the first time machine was invented. 4) Nobody’s showing off. 5) There would be physical traces. 6) Screwing with cause and effect would change the laws of probability. 7) History proves they’re not doing it.
The linchpin is offered by Gary Feldman (physics, Harvard):
“If time travelers are constantly changing the past, they are not very good at it. Why did they not avoid two disastrous and pointless world wars in the past century?”