What is the universal law to all human interaction?

Assuming there is a law that could be universal for all humans, a law that should be adhered to, that would make the world a better place. What would it be? Remember it has to be applicable to everyone, every religion, every race, even terrorists. I think I have the perfect answer. But i'm curious to hear yours. show more Assuming there is a law that could be universal for all humans, a law that should be adhered to, that would make the world a better place. What would it be? Remember it has to be applicable to everyone, every religion, every race, even terrorists.

I think I have the perfect answer. But i'm curious to hear yours.
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