Algodoo

The Galton Board or bean machine is a device to demonstrate the normal distribution.
http://en.wikipedia.org/wiki/Bean_machine
http://en.wikipedia.org/wiki/Normal_distribution

Circles get spawned automaticly until a circle number from 3000 is reached. You can change the number of maximal circles by editing scene.my.max

After a few minutes of simulation you can see the bell curve of the nomal distribution at the bottom.
The more circles get spawned the better you can see it.

Attention!
This scene may not run on older PCs. At the end of the Simulation the scene contains more than 5000 Objects.