Several times throughout history, groups of soldiers marching in rhythm across a suspension bridge have caused it to collapse. Scholars experiment with pendulums, resonance, and force to determine why this would happen. First, pupils...

Learners research tornadoes. For this weather lesson, students construct a KWL chart on tornadoes and view the video National Geographic-Tornadoes. Learners discuss the facts they learned from the film and complete the KWL chart.