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Computer experts use codes and encryption to protect sensitive data and to thwart cyberspies. Only those who are supposed to have access to the data know the key to unlock the codes. You can use codes, too, to send a secret message to a friend. Here are four fun ways to encode your words. Be sure your friend knows the key to unlock the message. As a bonus, we’ve included a fun way to define an easy-to-memorize secure digital password.

Learn about Celsius and then translate what those temps mean in the real world. From The Critical Thinking Co.'s Mathematical Reasoning® Level D. Written to the standards of the National Council of Teachers of Mathematics.

Writing prompt gets kids thinking about why we have seasons. Even though the days start getting longer again after the winter solstice, the temperatures around us continue to get colder. Why do you think this happens?

Think of one thing you can do to save the earth (and reduce your carbon footprint). Write it on the lines below. Then cut out your footprint. Provided by Simon and Schuster Resources.

Build your child’s interest in math and science by helping him to observe, estimate, and weigh objects at home. Created by the U.S. Department of Education.