In our travels, we have come across many equations — math for understanding the universe, for making music, for mapping stars, and also for tipping, … - Libba Bray

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In our travels, we have come across many equations — math for understanding the universe, for making music, for mapping stars, and also for tipping, which is important. Here is our favorite equation: Us plus Them equals All of Us. It is very simple math. Try it sometime. You probably won’t even need a pencil.