The Four Laws of Thermodynamics—For Twin Toddlers

Twin toddler boys scoop the last of the chocolate ice cream
  • 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.

Wikipedia: Laws of Thermodynamics