## The Paper Balloon Paradox Mystery

by Nancy Foote

Two of my favorite things are bubbles and balloons.  I once had a part-time job delivering balloons.  How I loved that job!  I learned a lot about gas laws.  I found out balloons take up less volume in cold weather and expand in hot weather.  (Some of those lessons I learned the hard way.)  I gained plenty of insight into people… and tips… and, of course, balloons!

## July 20, 1969: My Apollo 11 Memories

By Ted Beyer

There are certain days in history that pretty much anyone who was alive at the time can remember as though it was yesterday.  Times of trial and triumph.  Heart-wrenching times like September 11th, or the day Kennedy was shot, or the Challenger.  And then there is the day that we landed on the Moon.

## You Said It! Sound and Waves Product Reviews

We know that teachers are always looking for new ways to demonstrate sound and waves in their classroom.  How do you teach something you can’t see or touch?  We have some great ideas.

Read on to hear what our customers are saying about some of their favorite EI sound and waves teaching tools.  If you have a favorite Educational Innovations product, we invite you to send us a comment below.  We’d love to share your review with your fellow teachers and science lovers.

## Potential and Kinetic Energy Explained

by Arthur Murray

Teaching about potential and kinetic energy is always exciting, whether your students are in kindergarten or college.  There is so much to explore, and the world is full of examples of these types of energy in action.  Any time that you’re chewing gum, typing on your computer, or launching a rubber band into the air…  you are demonstrating potential and kinetic energy in all its glory.

## Using Solar Cells to Teach Series and Parallel Circuits

By Marty Mathiesen

During the electricity unit in my high school physics class, I like to do an activity in which students determine the effect of having batteries placed in a series circuit and also in a parallel circuit.  We explore questions such as What are the similarities?  The differences?  What are the advantages of each method?  Do you see any patterns?