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On the fifth day, which was a Sunday, it rained very hard. I like it when it rains hard. It sounds like white noise everywhere, which is like silence but not empty.

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Steven Strogatz

Looking at numbers as groups of rocks may seem unusual, but actually it's as old as math itself. The word "calculate" reflects that legacy - it comes from the Latin word calculus, meaning a pebble used for counting. To enjoy working with numbers you don't have to be Einstein (German for "one stone"), but it might help to have rocks in your head.