Lafacroft is a web site dedicated to the TI-Nspire graphing calculator. Its archive contains over 100 documents, each tested by the site's owners. Check out the forum to offer documents, exchange teaching ideas, ask and answer questions, and share events.

Terry Stickels writes and speaks about how to improve mental flexibility and creative problem solving skills. His books, calendars, card decks and newspaper columns are filled with fun and challenging puzzles that stretch the minds of even the best thinkers.

Terry has redesigned and added to his site since we last featured it four years ago. Read about and purchase his books, Frame Games and Stickelers (puzzles), or schedule him to speak at an event. Terry also links to some of his favorite puzzle and math sites on the Web.

Also available in Spanish, which extends the resources to include Spanish-language discussion forums, simulations such as approximations of pi, games such as tangrams, instructional videos, and more.