Reglas

Rules of Thumb (http://rulesofthumb.org/) es un sitio genial, que enumera reglas básicas de cualquier cosa. Navegarlo es aprender.ç

Ejemplo:

BUYING MUSIC
If you like a new song when you first get it, you'll tire of it in four weeks; if you hate it at first, you'll like it in about six months; if you feel indifferent about it, you'll always feel that way.

Link: Rules of Thumb