Related:

• It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to mathematics, though she is still forbidden to resort to physics and chemistry.
  -- H.L. Mencke...
• If it smells it's chemistry, if it crawls it's biology, if it doesn't work it's physics.
• Love is a matter of chemistry, but Sex is a matter of physics.
• Theoretical Physics is a science locally isomorphic to Mathematics.
• 1. If it's green or wriggles, it's biology. 2. If it stinks, it's chemistry.
  3. If it doesn't work, it's physics. 4. If it's incomprehensible, it's mathematics....
• It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to mathematics, though she is still forbidden to resort to physics or chemistry.
  -- H. L. Mencken, Notebooks, 1956...
• Love is a matter of chemistry; sex is a matter of physics. -- Mark's mark
• If it's green or wiggles, it's biology. If it stinks, it's chemistry.
  If it doesn't work, it's physics....
• Murphy's Guide to modern Science: 1. If it's green or it wriggles, it's biology.
  2. If it stinks, it's chemistry. 3. If it doesn't work, it's physics....