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The Exploratorium described Arab discoveries; contributions in astronomy that mapped the solar system and prepared the way for Copernicus, physicians who described the body organs and prepared the way for Harvey, cartographers who mapped the known European, African and Asian world before the voyages of Vasco da Gama, and mathematicians who refined Greek mathematics, introduced spherical geometry, algebra and the Arabic numeral system that included the Indian "zero.
Luckily, the Roman numeral system uses a bar over a letter to multiply it by 1,000.
It is thus remarkable that the similar representation of Greek and Egyptian fractions has never led historians of mathematics to see the similarity of the entire alphabetic numeral system with the demotic numerals.