Amazing Skill: Manipulating a Mental Abacus

What these Indian girls are apparently doing is manipulating in their minds and with gestures an imaginary abacus. This technique helps them keep the numbers in the man's rapid-fire math questions straight. He can barely keep ahead of them with his electronic calculator.

-via Daily of the Day

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Anyone remember Chisanbop?

https://en.wikipedia.org/wiki/Chisanbop

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Wish I knew what was going on in their heads. Wonder if I could find a teacher for that skill.

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Reminds me of the "air abacus" scene in the anime series Space Brothers (http://www.crunchyroll.com/space-brothers/episode-13-3-d-ant-594811, skip to 5:05 minutes in, the relevant bit is about 2 minutes long).

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They're just punching in the numbers on their invisible calculators, of course!

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Excellent find.

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