Population Growth "Game"
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1) Select an initial population:
 United States
2) You can change the following if you wish:
Fertility Rate: 
Life Expectancy:
 50 Years
 70 Years
Average Mom:
 25 years old
 30 years old
3) Hit the button:
0 to 9
10 to 19
20 to 29
30 to 39
40 to 49
50 to 59
60 to 69
70 to 79
80 to 89
90 to 99
Try these experiments:
  • How long does it take the population to double in the United States? (Note: Each time you press the "Next Generation" button, ten years pass.) How long in Mexico?
  • What fertility rate gives a stable population? Choose a country then type in 2.0 for the fertility rate. See what happens in 100 years (10 generations). Then click the country again to reset the population. Adjust the fertility rate up or down by about 0.1. Check again. What fertility rate leads to a stable population? Why does the population grow for many years before stabilizing?
  • Why does Mexico grow faster than Netherlands (even if you set the fertility rate the same)?