Editing 1900 in science (section)

==Physiology==
* [[Karl Landsteiner]] makes the first discovery of [[blood type]]s, identifying the [[ABO blood group system]].<ref>{{cite journal|last=Landsteiner|first=K.|title=Zur Kenntnis der antifermentativen, lytischen und agglutinierenden Wirkungen des Blutserums und der Lymphe|journal=[[Zentralblatt für Bakteriologie]]|year=1900|volume=27|pages=357–62}}</ref>
* [[Carl Rasch (physician)|Carl Rasch]] coins the term '[[polymorphous light eruption]]'.
* [[Takamine Jōkichi|Jōkichi Takamine]] and Keizo Uenaka discover [[adrenaline]].<ref>{{cite journal|last=Yamashima|first=T.|title=Jokichi Takamine (1854–1922), the samurai chemist, and his work on adrenalin|journal=Journal of Medical Biography|volume=11|issue=2|pages=95–102|year=2003|pmid=12717538|doi=10.1177/096777200301100211}}</ref>