This site is an excellent supplement for any textbook covering similar
materials and many of the applets could be used for demonstration purposes
during a lecture. Readers that use this site will, most likely, find themselves
drawn to the other parts. The sense of enthusiasm the author conveys
is most certainly contagious.
Some lessons, such as the Chinese Handcuffs lesson, are simply an interesting
GSP sketch or java applet together with a list of questions for further
exploration. Some of these questions may be (or lead to) problems
that are appropriate for undergraduate research.
Other lessons such as the Tangent Circles lesson have interesting
questions that many students would never think to ask, such as:
-Why do some configurations have fewer solutions than others?
-Why do some configurations have no solutions?
With its excellent visual presentation of some very interesting and
(dare we say) fun problems from several fields of mathematics,
site uses that are too numerous to list in one review