Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.
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Often I hear people say they do not have time to read. That's absolute nonsense. In the one year during which I kept that kind of record, I read twenty-five books while waiting for people. In offices, applying for jobs, waiting to see a dentist, waiting in a restaurant for friends, many such places.