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1644 in science
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==Deaths== * 2 July – [[William Gascoigne (scientist)|William Gascoigne]], [[English people|English]] scientist (born [[1610 in science|1610]])<ref>{{cite book|last1=Vaquero|first1=J. M.|last2=Vázquez|first2=M.|title=The Sun Recorded Through History|date=2009|publisher=Springer Science & Business Media|isbn=9780387927909|page=236|url=https://books.google.com/books?id=iWkyiEeiyksC&pg=PA236|language=en}}</ref> * 30 December – [[Jan Baptist van Helmont]], [[Flemish people|Flemish]] [[chemist]] (born [[1580 in science|1580]])<ref name=Helmont>{{cite web|title=Jan Baptista van Helmont - Belgian scientist|url=https://www.britannica.com/biography/Jan-Baptista-van-Helmont|website=Encyclopedia Britannica|accessdate=3 April 2018|language=en}}</ref>
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