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Programming
Why do computers use binary?
Because it is far easier to build a component that reliably tells apart two states than ten, and reliability is what matters when you are switching billions of times a second.
5 min read1
Mathematics
Why does 0.999... equal exactly 1?
Because the notation does not mean a number creeping toward one — it means the value the sequence of finite pieces converges to, and that value is exactly one.
6 min readintermediate1