"There are many different kinds of radioactive waste and each has its own half-life so, just to be on the safe side and to simplify matters, I base my calculations on the worst one and that's plutonium."

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A watch can only tell us how much time it is, how much time has passed, or how much time must still pass before something will occur. These statements are related not to time itself but only to its measurement or calculation.

— Medard Boss