Abacus, the oldest gadget on Earth

The abacus is an ancient calculating tool that was widely used in parts of Asia until recent decades. Consisting of a wooden frame and moving beads, it lets you do mathsperform calculations just by flicking your fingers.
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Before the world had electronic calculators, smartphones, the Google search bar, or even paper -- there was the abacus. The simple rectangular gadget doesn’t require batteries, RAM, or the internet to run. Spill your coffee on it? No problem -- it’s also waterproof.

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