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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

Reference: http://www.moneychimp.com/features/rule72.htm

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What is the small country in south-western Europe between France and Spain?

Andorra, a country with population 69,150 is in south-western Europe, between France and Spain.


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How big is South America?

South America has an area of 17,840,000 kmē (6,890,000 sq mi), or almost 3.5% of the Earth's surface. South America ranks fourth in area (after Asia, Africa, and North America) and fifth in population (after Asia, Africa, Europe, and North America)

Reference: http://en.wikipedia.org/wiki/South_America

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The population of China

If the population of China walked past you in single file, the line would never end because of the rate of reproduction.


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A fact that helps put China's population in perspective

China has more English speakers than the United States.


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The Atom Bomb got all the press

US forces fire bombed japan's wooden cities totally destroying 58 % of Yokohama (the size of Cleveland) 51% of Tokyo (new York) 99% Toyama (Chattanooga) 40% Nagoya (LA) killing 50-90% of the population in 67 Japanese cities BEFORE two nuclear bombs were dropped.

Reference: fog of war

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One in a million means there's how many in china?

If you say somebody is 1 in a million you are saying there are 1,317 of them in China (as of 4/30/07)

Reference: http://www.cpirc.org.cn/en/eindex.htm

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U.S. population, and how many people do you have to poll?

When a poll tells us a candidate for president of the United States is favored by ___% of the population, they tell us it has a "margin of error" of +-__% .

For example, August 6, 2008, CBS poll on the president of the United States put John McCain with 39% of the vote and Barrak Obama 45% of the vote, with a margin of error of plus or minus 3 percentage points.

The World Fact Book reports U.S. population at over 300 million, 301,139,947 (estimate as of 2007).

How many people do you think you'd have to poll to get within plus or minus 3% or 300,000 of the correct vote?

10 million? 1 million? This particular CBS pre-poll accurately extrapolates the minds of over 300 million people by polling just 906 people, or .00009 % of the population.

We're not so different after all!

Reference: http://www.cbsnews.com/stories/2008/08/06/opinion/polls/main4325670.shtml

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