High School Physics/Heat
"Students, as you do know, the reason why heat exists is because it is merely just another form of energy. When you say, that you would rather avoid the heat, than get out of this universe! Without the existence of heat, many things would simply not be able to exist in the real world. Heat is what makes those brownies crisp. Heat is also what makes that ice melt."
Concepts: -The 3 laws of thermodynamics. -Entropy and enthalpy.
Problems -the stable temperature when combining hot and cold water.