What will happen if I send an electron back in time?

You can’t. However, mathematically, positrons appear to be electrons that are going back in time. Richard Feynman suggested, therefore, that maybe they do move in both directions in the time.

However, if you look at Feynman’s life, you will see that many of his actions were quite crazy. His statements about space-time are just one example.

You mean, you want to join a band of homeless musicians from Brazil? Not like most physicists…

We can still say that an electron cannot be sent back in time. However, if you remove some of his fluff, it is possible to take a video of an electron moving forward in the past and run it backwards. You would be able to see it behave just like a proton if you did this.


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