In my Phil 114 class my professor gives out puzzles each week. This is the solution to one of the puzzles in a visual format. The puzzle is:
You have a 13 gallon bucket, an 18 gallon bucket, and an endless supply of water. You need to measure out exactly 1 gallon of water, using only these tools. (Neither bucket has any markings on it for measuring.) How do you do it?
This is just a little educational use of flash, not heavy on graphics, but I think it does the trick. Plus I made both the .swf and .fla available for download at www.bellinghambandits.com , do what you wish with them.
Can't get the links to work with NG here is the link for the .fla files etc, http://bellinghambandits.
squarespace.com/tutorials /2008/11/12/gallon-puzzle .html#entry2553298