Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

The Joke

The comic retells the nursery rhyme "Humpty Dumpty" using physics terminology. Each verse of the original rhyme is paired with a physics-based restatement:

• "Humpty Dumpty sat on a wall" becomes a description of his height (Y), mass, and the normal force (N = 648 N) keeping him on the wall.
• "Humpty Dumpty had a great fall" becomes a description of him falling "off the wall" and "diminished his Y in the gravity well," with kinematic equations calculating his velocity (v) at impact (14 m/s).
• "All the king's horses and all the king's men" are recast as "all the king's thermodynamicists," who recognize that Humpty has "scattered his entropy beyond repair" -- he "lacked the E [energy] to put Humpty together again."
• The final panel offers comfort: "Don't cry for Humpty... he's just gone to warm the rest of the universe up" -- a reference to heat death.

The Humor

The humor comes from the incongruity of applying rigorous physics to a simple children's nursery rhyme. The comic systematically translates every element of the story into physics concepts: the fall becomes a kinematics problem, the inability to reassemble Humpty becomes a statement about the second law of thermodynamics (entropy always increases in a closed system), and the "happy ending" is reframed as Humpty's thermal energy dissipating into the universe.

The substitution of "thermodynamicists" for "men" is particularly funny because it reframes the king's futile rescue effort as a fundamental physical impossibility rather than mere incompetence. You cannot put Humpty together again not because you lack skill, but because the second law of thermodynamics forbids it -- his entropy has irreversibly increased.

The final consolation that Humpty has "gone to warm the rest of the universe up" is a darkly humorous reference to the heat death of the universe, the theoretical final state where all energy is uniformly distributed and no useful work can be done.

References

• "Humpty Dumpty" is a traditional English nursery rhyme, first published in 1797.
• The second law of thermodynamics states that the total entropy of an isolated system can only increase over time.
• The heat death of the universe is a hypothesis about the ultimate fate of the universe in which it reaches maximum entropy.
• The kinematic equations shown (mgy = KE, v = sqrt(2gy)) are standard physics for calculating the velocity of a falling object.