Bug Observed

I just recently noticed that one of our oldest Gizmos (2D Collisions - Activity B) is not correctly functioning on Macintosh computers. We will look in to this Monday morning. In the meantime, you could use the more modern versin of this Gizmo, called 2D Collisions -Activity A.

Update: Friday morning. I'm working on this one for an hour or so this morning. Wish me luck! I'll continue to work on it in my spare hours this week. Using Activity A until we solve this problem is advised, since that newer version functions properly.