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Hyperreality
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How many digits of number can you multiply mentally? I can just manage two digits...
Recently I've be reading Roger Penrose's Emperor's New Mind,
Recently I've be reading Roger Penrose's Emperor's New Mind,
:surprise:There are human 'calculating prodigies' who can perform very remarkable feats of mental arithmetic with unfailing accuracy and apparent effortlessness. For example, Johann Martin Zcharias Dase, an illiterate farmer's son, who lived from 1824 to 1861, in Germany, was able to multiply any two eight figure numbers together in his head in less than a minute, or two twenty figure numbers together in about six minutes!