Rules of thumb. Wiki he say: A rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or recalling some value, or for making some determination. A site well worth checking every day for stuff like:
The ideal viewing distance is 2.5 times the diagonal width of your television screen.
CONTROLLING YOUR CAT
If you don’t want a cat to jump into your lap, don’t make eye contact with it.
When questioned by a Police Officer be aware that he already knows the answers to alot of the questions he is asking you, that is how he tests your general honesty.
WHAT NOT TO VACUUM.
Never vacuum up vomit.
WRITING A BOOK
Someone who can’t write three clear sentences in a row will never write a good book.