A rule of thumb turns information you have into information you need. The goal of this website is to gather every rule of thumb on earth into one gargantuan, easily searchable online reference database that will be accessible from anywhere in the world and continue to grow forever.
Some featured rules cover how to choose a lawyer, the safe stopping distance at traffic lights, caring for your car, and winning at blackjack. There are 151 categories of rules so far! You can submit yours, too. Link -Thanks, Tom!