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==Life sciences== * [[Jan Swammerdam]] observes [[red blood cell]]s (in the [[frog]]) with the aid of a [[microscope]].<ref>"Swammerdam, January (1637β1680)". ''McGraw Hill AccessScience''. 2007. Retrieved 2007-12-27.</ref><ref>{{cite web|url=https://www.pbs.org/wnet/redgold/history/timeline2.html|title=Red Gold β Blood History 1000β1699|publisher=[[Public Broadcasting Service|PBS]]|year=2002|accessdate=2011-10-28}}</ref> * Samuel Volckertzoon observes a [[quokka]] on [[Rottnest Island]].
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