Thanks go to the following websites and their maintainers for helping out with graphics material:

- a great start for creating text graphics!

Eclipse, home of Animation factory - it's great!

Animations from Web Warriors

There are also numerous resources used on this site (pictures, maps, etc.) that are thanks to individuals, universities, etc. A bunch of thanks to them too, they are referenced at the appropriate locations throughout the site.

Also many thanks to two people who helped with the online quizes, especially Joseph O'Rourke of Smith College's Computer Science Department, and Zhao Wu of Princeton's Electrical Engineering Department. Thanks!