Numbers: Mar. 5, 2007

6.1 Average number of children that women bear in Rwanda, whose population is expected to double by 2030

3 Limit on children per family proposed by Rwandan legislators to curb rising poverty levels

30 Years a dollar coin can circulate, compared with 18 to 22 months for a dollar bill

$500 million Amount the U.S. would save each year if dollar bills were replaced by coins, like the new, golden George Washington ones released Feb. 15

$13 billion Value of the proposed merger of XM and Sirius, the only companies licensed to offer satellite radio in the U.S.

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