Estimates of how much money a government program will cost are notoriously unreliable. Estimates of the cost of the current bailout in the financial markets run into the hundreds of billions of dollars, and some say it may reach or exceed a trillion.

Many people have trouble even forming some notion of what such numbers as billion and trillion mean. One way to get some idea of the magnitude of a trillion is to ask: How long ago was a trillion seconds?

A trillion seconds ago, no ...

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