What do a non-newtonian fluid and a massochist have in common?

They get hard when you punch them

Relativity theory

In classical (Newtonian) physics, we can't solve the three-body problem. In the theory of relativity, we can't solve the two-body problem. In quantum mechanics, we can't solve the one-body problem, and with quantum electro dynamics, we don't even understand the vacuum anymore.

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