Since the "will the plane fly" thread got so much attention, here is my favorite logic puzzle:

Suppose you have two lengths of cannon fuse. Suppose that you know that each of these fuses will take exactly 60 minutes to burn, but they burn at a variable rate along the length of the fuse (you can't just cut a fuse in half to get 30 minutes of burn time).

Using only these fuses (and a box of matches), how would you use them to measure a 45 minute interval?

Good luck. This one took me a couple of days.

Jim