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1900 in science
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== Medicine == * English surgeon and ophthalmologist [[Edward Treacher Collins]] describes the essential traits of [[Treacher Collins syndrome]].<ref>{{cite journal|last=Treacher Collins|first=E.|year=1900|title=Cases with symmetrical congenital notches in the outer part of each lid and defective development of the malar bones|journal=Transactions of the Ophthalmological Societies of the United Kingdom|volume=20|pages=190β192}}</ref> * German gynecologist [[Hermann Johannes Pfannenstiel]] publishes his description of the "[[Pfannenstiel incision]]", a transverse incision used in genitourinary surgery that continues to be widely used.
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