"I'm tired of hearing all this talk from people who don't understand the process of hard work-like little kids in the back seat asking 'Are we there yet?' Get where you're going 1 mile-marker at a time."

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The atom can't be seen, yet its existence can be proved. And it is simple to prove that it can't ever be seen. It has to be studied by indirect evidence - and the technical difficulty has been compared to asking a man who has never seen a piano to describe a piano from the sound it would make falling downstairs in the dark.

— Carl David Anderson