I has to do with an irregularity in the Fibonacci series. Note: 5x13 triangle. This can be done with an 8x21, or a 13x34, etc. The pieces, if this is done with paper, will not line up perfectly, and the hole is one unit square in area. This cannot be seen as well on a triangle, though. Fifth explained it pretty well.
Anyways, here is my official riddle. Shouldn't be TOO difficult. It is actually blatantly obvious.
Before the 26th Amendment, the minimum age required to vote for president was 21 years old. Why is it that, despite the 26th Amendment to the U.S. Constitution which lowers the voting age to 18, that there are still many American citizens who cannot legally vote for president until they are 21?
EDIT: Riddle slightly revised because of an ambiguity that LD pointed out. (As an answer)
~I.S.~
Edited by - Insane Steve on 6/14/2004 6:49:16 PM