According to professor Paul Kindstedt, who teaches a course on the history of cheese at University of Vermont, cheddar's origins go back to the 14th Century, when local cheesemakers implemented a process known as "scalding" (heating the curds to high temperatures in order to force liquid whey from the cheese) before pressing the curds into a harder cheese. Since a cheese's moisture level is what makes it perishable, scalding enabled cheddar to last longer.