http://blog.wolframalpha.com/2010/05/27/remembering-martin-gardner/

Ed Pegg, Jr. has posted a remembrance of how the late Martin Gardner influenced his mathematical thinking. Drawing on Wolfram|Alpha, Demonstrations, and MathWorld, Pegg's resources include:

• Knots
• Random walk
• Möbius strip
• Klein bottle
• Graph theory
• Necklaces
• Dragon curve
• Fibonacci numbers
• Latin square
• Pascal's triangle
• Zeno's paradox

http://www.math.washington.edu/~nwmi/sum/summer2010/prog/mini.html

Northwest Mathematics Interaction, an affiliate of Park City Mathematics Institute, offers a special professional development opportunity this summer at the University of Washington in Seattle, July 28-30.

The program coincides this year with a conference celebrating the geometry and other mathematics of Vic Klee and Branko Grünbaum. Brian Hopkins will facilitate a group of teachers who will attend selected research talks, with preparation and reflection sessions.

Register before June 15 to save $25.

There is also space in the Numerical Delights short course, July 26-27. This course is intended for high school teachers or anyone else interested in the historical development of number theory, exploring topics relevant to the high school algebra and precalculus classroom. The link above includes information about both courses.

http://www.exploratorium.edu/geometryplayground/

San Francisco's Exploratorium is opening its newest exhibit on June 25: the Geometry Playground. People-sized exhibits let you use your hands, brain, and body to play with physical demonstrations of geometry concepts. Exhibits fall under the categories of seeing, moving, and fitting things together, and include interactive artwork by geometric artists-in-residence.

The Geometry Playground closes at the Exploratorium on September 6, then travels to St. Paul, San Diego, and other science museums in cities around the country.