If you need a unit to grab those reluctant learners and "Power" them up, you can't do better than force and motion! It's filled with experiments, plus lots of movement and action. It's everything kids could want! Get links to everything you need on this post!
Bottle Ecosystem, This is the most awesome class idea to teach ecosystems! Its self contained and you can observe the activity for the rest of the year. No mess no fuss and all of this cost about 17 dollars.