Become an engineer, and design a submarine that moves in the water like a real submarine. Try making it sink, float, and hover in the water.

In this lesson plan, young scholars will apply mathematical, science, and engineering concepts to experiment with balancing levers. They will learn to classify types of levers to design and build a simplified mobile. Students will...

This site from Glencoe Publishing not only explains hypothesis but also tells how to design an experiment to test your hypothesis. Includes the difficult task of "Separating and controlling variables."