This is a forum and all the user can post their comments and suggestions (attach files are also possible).
All the user are welcomed to upload their worksheet (Yes I did receive worksheet before and that is the reason I transform my web site into a forum).
I hope more users can contribute.

May be I should make it more obvious so that user will do it in a more nature way.
I will add the following message to all the applet
[quote]
Please feel free to:
[list]
[li]post your ideas about how to use the simulation in the classroom[/li]
[li]post questions to be asked to help students to think, to explore.[/li]
[li]upload worksheets as attached file to share with more users [/li]
[/list] [/quote]

I will try to create a new interface so that it will be easier to input and share ideas.
Your suggestions are always welcomed!