Test your skills at different levels. A great mind exercise. Brain Teasers - Site has brain teasers of the week, solutions and archives of past puzzles.
Students can submit answers directly.
Little Explorers Alphabet Learn the alphabet by exploring the web. Children's Literature Authors and Illustrators - Web sites links to authors and illustrators. Children investigate structures and the affects of forces, motion, and equilibrium. They construct models of walls, bridges, and towers, and classify building materials by strength, weight, and other properties. Constructions is published by Creative Publications and is part of their Windows on Science program for young children.