I'm 6 hours into RTW and already playing with the math. Here are doubling rates for population expansion - actually, doubling rates for anything, given a particular percent increase:

% Years to double
---- ----------------
0.5 140.0
1.0 70.0
1.5 46.7
2.0 35.0
2.5 28.0
3.0 23.3
3.5 20.0
4.0 17.5
4.5 15.6
5.0 14.0
5.5 12.7
6.0 11.7
6.5 10.8
7.0 10.0
7.5 9.3
8.0 8.8
8.5 8.2
9.0 7.8
9.5 7.4
10.0 7.0

It follows the simple exponential math rule of 70, a.k.a. 70/% = years, where % is the percent increase.

OMG this looks really messy! Can anyone show me how to post text that's nicely indented in columns, using this board's html? Html loves to strip out formatting -

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