Editing 1768 in science (section)

==Mathematics==
* [[Leonhard Euler]] uses [[closed curve]]s (which become known as [[Euler diagram]]s) to illustrate [[syllogism|syllogistic]] reasoning.<ref>{{cite book|last=Euler|first=L.|title=[[Letters to a German Princess|Lettres à une Princesse d'Allemagne]]|location=Saint Petersburg|year=1768}}</ref><ref>{{cite journal|last=Baron|first=Margaret E.|author-link=Margaret Baron|title=A Note on The Historical Development of Logic Diagrams: Leibniz, Euler and Venn|work=The Mathematical Gazette|jstor=3614533|publisher=[[Mathematical Association]]|volume=53|issue=383|pages=113–125|date=May 1969}}</ref>