Ok, as an example, I once read in a physics book about a time paradox. I can't remember exactly how it goes, but I'm sure someone can fill in the blanks.

We have 2 people traveling in space ships at the speed of light towards each other, and each person is holding a clock out the window, and each of them see the time on the clock as they pass by each other. Now I can't remember if the clocks are supposed to be stopped or going faster/slower, but I know it's a paradox of relativity.

I didn't mean anything along the lines of 1 theory being used in a completely different area such as quantum mechanics being used to explain relativity.

I'm just wondering here, that's all.

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