Nicholas Copernicus and the inception of bread-buttering.
D001939:Bread; D002079:Butter; D005060:Europe; D005197:Famous Persons; D005247:Feeding Behavior; D049669:History, 16th Century; D006801:Humans; D010930:Plague / Q000266:history; D011315:Preventive Medicine / Q000266:history*
D002079:Butter