three hundred thousand years
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2012 years ago
It depends on whether you are English or American. The traditional English billion is a million-million, while the traditional American billion is a thousand-million. Thus English Billion is 1,000,000,000,000 American Billion is 1,000,000,0009
It is worth a nickel. 2004 is only 13 years ago. Not very long ago.
It is 11.3%, approx.
As many as you like; pi is an irrational number. That means that there are no two whole numbers that you can make into a fraction exactly equal to pi. It also means that if you start to calculate pi as a decimal it never ends and never recurrs. It just goes on forever. A few years ago two Japanese people calculated pi to eight million places of decimals, which they then published in a book. It just never ends. * * * * * Update: in October 2011, pi to 10 trillion (and 50) digits was published. See link.