Before the 13th century Europeans used Roman numerals to do arithmetic. Leonardo of Pisa, better known today as Fibonacci, is largely responsible for the adoption of the Hindu–Arabic numeral system in ...
There was a time when a zig-zagging line didn't mean two, and a circle didn't mean zero. NPR's Eric Westervelt talks with Amir Aczel about the origins of our numbers and his book, Finding Zero. So ...
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