TIL that CD audio is at 44.1 kHz because humans can only hear up to 22.05 kHz and by the #Nyquist sampling theorem, if we sample at twice the frequency we get a perfect recreation.

@JordiGH I've read alternative theories that it's 20kHz × 2 plus a bit because of quirks of the storage format used by studios. We'll probably never know for sure, much like the competing, incompatible theories as to why terminals were 80×25.

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