Also if you want to make them efficient you will have to invent thermodynamics. https://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carnot https://en.wikipe

Also if you want to make them efficient you will have to invent thermodynamics. https://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carnot https://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carn...