/sorry for bad english/
Long ago, in yearly middle-school time I am argue with friends about optimum(by combined simplicity and taste score) way to bake frozen pizza, and all about with electric heating oven VS microwave. After some time oven was chosen, but I thinked that made oven pre-heaten was waste of time and try to approximate it with longer cooking in just powered oven. I have been tried to made some calculations with paper and microcalculator. Some years after I remembered it and understood that I was reinvent some integration stuff.
And pizza was burnt because all of this distraction