By Alan Ticotsky. First experiment, then understand—that’s how these books work. First, students perform an activity or experiment and try to understand what it tells them about how the world works or how science is conducted. They then study a reproducible handout with a reading about the original discoverers and classic experiments underpinning the theories that apply to and explain the phenomena under investigation. Grades 5–8. Glossaries. Bibliographies. 8½" x 11". The Big Bang, the solar system, orbits and planetary motions, Earth's history and composition, weather, and climate are the main topics of these 25 activities. 156 pages.