Amazing Old Calculator (Curta) - Numberphile

Alex's book: http://amzn.to/1l0yX46
The Curta is a pocket-sized, mechanical, digital calculator!!! It was invented by Curt Herzstark.
More links & stuff in full description below ↓↓↓

Shown here by Alex Bellos, author of Alex's Adventures in Numberland.

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