Did you know before computers, we used mechanical calculators? Fall asleep learning about The Monroe Adding Calculator, read by Jason

Each episode of the ZZZ show is designed to be uninteresting to help you fall asleep. We'll read for around 40 about the device, to give you plenty of time to fall asleep. Today we are reading about the Monrow Adding Calculator, a mechanical calculator from the days before the modern computer. You'll learn how to add, subtract, multiply and divide using this marvelous device.

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