[Pete]

Sounds like it was from the script of the old Kung Fu Tv series.

Actually, it is an old French riddle used to explain the difference between linear and geometric progressions (like simple versus compound interest).

[jessduntno]

How about;

If you build a Mosque on the killing fields in lower Manhattan, on day 1 you will have 300 Moose Limbs ... how long will it be before it is a no-go zone? On day 2, etc.

You could then work in how many fire engines will be required to put out the constant arson flames, the amount of cement work needed in front to bulwark it ... well, you get my drift ... spice it up a bit?

Good thoughts, though. Seriously.

[Cyrano]

I understood your point, but it did take a bit of reading. Explaining concepts like this is tricky; I’ve found graphics to be pretty useful and more understandable to most. I’d suggest a side-by-side comparison of the two ponds visually; doing it as an animation would be a stronger illustration.