Bet you've never seen math magic like this.
These kids in India are solving complex math problems on the abacus, a traditional counting apparatus invented in China.
Except they've skipped past needing to use the actual abacus, and are doing it entirely in their heads, with their fingers rapidly operating a virtual abacus.
They're using a method called Mastermind Abacus, and it's fascinating to watch them at work.
Who needs a calculator when you've got your hands?
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