Puzzlemaker Clip Art Gallery Lesson Plan Library Kathy Schrock's Guide for Educators Brain Boosters Learning Adventures Science Fair Central Curriculum Center On TV Young Scientist Challenge Enter Username Access resources you have created under your login. Teacher Tools such as: Lesson Plan Creator, Quiz Builder, and Worksheet Generator are no longer available. You can create new lesson plans and quizzes within your DE streaming account. If you don't have an account, sign up for a demo here.

Lateral Thinking Time to Tell   A sundial is said to be the timepiece with the fewest moving parts. What is the timepiece with the most moving parts?   An hourglass—filled with many grains of sand or other granular material. Inspired by a puzzle in Mensa Presents Mighty Brain Teasers, R. Allen & J. Fulton. New York: Barnes and Noble, 1999.

Check Requirements  |  Privacy Policy  |  Contact Us

Copyright © 2008 Discovery Education. All rights reserved. Discovery Education is a Division of Discovery Communications, LLC.