Rule facts

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The rule of 72
The rule of 72 is used to find the number of years it takes to double your money at a given interest rate.

(72/[interest rate]) = years until a principle doubles

So, how long will it take to double your money at eight percent interest? Divide 8 into 72 and you get 9 years.

If you collect 7% on your savings in a little over 10 years the amount will be double what it is today.

The rule of 72 also means that you can determine the time it takes for a population to double if it is growing at a steady rate by solving this function:

(72/[rate of growth]) = years for population to double

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Want more synchronicity in your life?
Talking about synchronicity increases synchronicity

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Where does the idiom "rule of thumb" come from?
The phrase "rule of thumb" is derived from an old English law which stated that you couldn't beat your wife with anything wider than your thumb.

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This fact about Australian Rules Football is quite a shocker
Australian Rules Football was originally designed to give cricketers something to play during the off season.

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How people measured things in the early days
In early times various body parts were used as tools and guides, hence the word "feet," or "the rule of thumb."

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