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TheInstitute for Research in Classical Philosophy and Science Since 1983 The Institute for Research in Classical Philosophy and Science is nonprofit educational organization incorporated in the USA and in Canada that is devoted to the advancement of scholarly research in the history of science in the Old World before the modern era. AESTIMATIO Sources and Studies in the History of Science Aestimatio focuses on the history of science from antiquity to the early modern period in the cultures of Eurasia and Africa recognizing that the spread of the traditions of knowledge and of ideas is a unifying characteristic of the chronological and geocultural scope of science in the Old World before the modern era. In Aestimatio we take science broadly to be the goals methods knowledge and practices in what is presented as science in the historical sources. Our aim is to make fundamental texts and ideas in the history of science accessible to readers today through the publication of original research as well as through scholarly assessments of books recently published.