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You could use something as simple as pennies.  It would be easy to show 10**0
to 10**3  after that you could talk in terms of putting them in tubs, trucks
trains, etc.  You might want to mention pyramid schemes (usually powers of 6)
where the 11th generation would require more than the entire population of N.
America and the 13th generation requires greater than twice the world
population.  (That's a lot of soap distributors!).
Greg Durocher