10. This list is in octal for theoretical reasons that are currently un-testable by any known technique.

7. You always feel “dirty” when you use an approximation, or round to three significant figures.

6. For a while you believed that there really were practical applications for the Schrödinger equation. That’s four months of your life you’ll never get back.

5. Entropy.

4. Unexplained headaches can be induced by any field with over six ways to define an apparently simple concept, like the radius of a molecule. And don’t even ask about viscosity, unless you’ve pre-dosed yourself with ibuprofen.

3. Statistical mechanics was essentially invented by Ludwig Boltzmann, and even he committed suicide over it.

2. Flatulence will never follow the ideal gas law.

1. What part of “if you use an equation, you should be able to derive the equation,” do you not understand?