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Interspersed among the entries are 182 short essays on topics of special interest and short biographies of 200 scientists (lists attached). Although the text is based on The History of Science and Technology (published by Houghton Mifflin in 2004), STEM Chronology is considerably revised, using a different format while adding many new entries and details to existing entries, extending the manuscript in both directions chronologically so that it now covers from 3,400,000 BCE to 2017.
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