Learn about forces by meeting some hilarious characters who are keen to explain why they are the most important! This book makes science learning fun and engaging for children aged 7 plus. Meet best friends Gravity and Weight who are surely, they think, the most important forces on Earth. And yet, isn't Gravity actually really weak and, anyway, their rivals Friction, Air Resistance and Magnetism all want to explain why they are the most important. So which force really matters most? What Matters Most is a series of humorous books for children that explain science processes with lively comic artwork and show why variety is important. Titles in the series: Body Bits Energy and Power Gravity and other Forces Materials Plant Parts The Sun, the Moon and the Planets.