Mathematical cake slice
Sir Francis Galton, creator of the concept of correlation and regression toward the mean, wrote a letter to the editor of Nature in 1906 on the best way to cut a circular cake. The result is moist cake with every slice, even if you eat it days later. Alex Bellos for Numberphile demonstrates in the video below.
I don't get it. I typically just eat a full cake in one sitting with a really big fork.