Intermediate GSP Lab: Spirograph Machine/"Tea Cusps and Saucers" http://forum.swarthmore.edu/sketchpad/intro/cusplab.toc.html This lab studies the effects (both mathematical and artistic) of circular motion as points rotate around circles. Interesting things occur when a point moves around a circle as the circle rotates around another circle.
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The Data and Story Library (DASL) http://lib.stat.cmu.edu/DASL/ Teachers often ask for - but frequently have to create for themselves - good data collections for students to analyze. DASL is an online searchable library of datafiles and stories that illustrate the use of basic statistics methods, providing data from a wide variety of topics so that statistics teachers can find real-world examples that will be interesting to their students. Stories by topic (Archeology through Zoology) and by method (ANCOVA through Two sample t-test); datafiles by subject (Agriculture through Weather). A form is available for submitting your story.
Pat Daley, one of our advanced institute participants, is working on a set of related web pages known as the Data Library:
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Is your math assignment driving you crazy?
Submit your K-12 math question via the Web or send e-mail to email@example.com. A member of our 'Swat Team' of math doctors will reply via e-mail, so be sure to send us the right e-mail address. K-12 questions usually include what people learn in the U.S. from the time they're 5 years old through when they're about 18.
A SEARCHABLE ARCHIVE of questions and answers is available. You may find that your problem has already been answered - some of the same questions arrive regularly. Here are a few examples:
The Forum administers two mailing lists that regularly feature math problems. The first is geometry-pre-college where we post the Geometry Problem of the Week and Project of the Month, both targeted at high school students. The other, geometry-puzzles, attracts less regular postings of higher-level geometry problems.