by Ray Trent » Sun Nov 08, 2009 9:07 pm
Hmmm... well, there are several routes one could go, but the trick would seem to be to have the shallowest possible slope that the marble will reliably continue to move on. Anything buildable by a 4th grader that depends on building up a lot of speed going down and then coming back up is likely to be too unreliable, I would think.
../ray\..