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Originally Posted by Crisis
There is such thing as time travel. When I wasn't listening the physics teacher was saying something about it somewhat working at subatomic levels. But I remember from years ago doing time dilation questions when objects move at near speed of light velocities.
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When radioactive substances emit positrons (positively charged electrons, which are antimatter to electrons), it somehow works out mathematically that the substance travelled back in time to get an electron. Or something like that. I prefer positrons...
Maybe that's what you were thinking of?