A science lesson doesn’t have to take 40 minutes or even several sessions of 40 minutes. It needs to be focused on the science you’re presenting, be interesting, and, of course, be fun! I’m teaching inertia and gravity in a fifth grade classroom. Between my 40 minute classes I want to keep students interested and talking about the topic. I could use a few short demonstrations to review or reinforce inertia and gravity. Do you have a meter stick? Try this Center of Gravity demonstration. Do you have a large glob of clay to add to the meter stick? Try this Balancing …