The Four Laws of Thermodynamics—For Twin Toddlers

Zeroth Law You and your brother both have a granola bar, stop complaining.
If two systems are in thermal equilibrium respectively with a third system, they must be in thermal equilibrium with each other.
First Law You’re going to feel better when you poop.
When energy passes, as work, as heat, or with matter, into or out from a system, its internal energy changes in accord with the law of conservation of energy.
Second Law Daddy cannot put the broken banana back together.
In a natural thermodynamic process, the sum of the entropies of the interacting thermodynamic systems increases.
Third Law It’s impossible to get it clean and keep it clean.
The entropy of a system approaches a constant value as the temperature approaches zero.