Arthur Conan Doyle quote about knowledge from A Study in Scarlet - there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.
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there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.
 Arthur Conan Doyle, A Study in Scarlet (1887). copy citation

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1887
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English
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