Bill Paetzke offers TI-83/TI-84 Plus programs to help students and teachers be more efficient in using their calculators. The programs are organized under these categories:

• Algebra
• Finance
• Geometry
• Physics
• Programs
• Statistics
• Trigonometry
• Tutorials

Read about Paetzke here:

http://www.paetzke.com/ti83programs/about/

Radin focuses particularly on the five Platonic solids -- the tetrahedron, the cube, the octahedron, the icosahedron, and the dodecahedron -- and the compound solids made from their dual pairs.

Areas of the site include:

• Platonic Solid Rock (the video)
• The Platonic Solids Discussion Group
• Computer Desktop Wallpaper
• High-Resolution Images
• Animated Gifs
• Polyhedral Origami
• Paper Polyhedron Plans
• Proof?! (a polyhedral screenplay)
• Lesson Plans
• National Standards
• Links
• Dan Radin's Bio
• Contact

http://www.goknow.com/sketchycontest/

Do you use Sketchy in the classroom? Do you know a budding artist who uses Sketchy to convey educational concepts? The GoKnow Sketchy Contest Team is hosting their 4th Annual Sketchy contest for students and teachers. Submissions are due May 25, 2007, and winners will be announced after June 4th.

First place finishers will receive a special 1 GB iPod Shuffle. Digital Cameras are on hand for all 2nd place finishers, and 3rd place secures a new addition to their prizes: the Pocket Mind Reader. Numerous honorable mention certificates will be provided for those who have their Sketchys posted on the Web.

The official flyer and rules can be accessed in PDF format from their site. You can also view previous winning Sketchy animations.

Demo versions for Palm OS or Windows Mobile are available for download:

http://www.goknow.com/Products/Sketchy/