Why can hot air balloons rise and fall

Author: Tong Xin
Publisher:
Publish Date: 2007-01-01
Features: Whether you remember it or not, you must have had such moments! The life and world that adults take for granted are utterly unimaginable to children. Little hearts are filled with questions—some expressed, some still lingering in doubt. Children who ask questions are curious children; curious children are children with a strong desire to learn; and curiosity is the most precious spark of wisdom! Every child's heart holds a spark of wisdom! This spark can burn brightly or dim and fade away. Fathers and mothers, apart from giving children the precious gift of life and ensuring they are free from hunger and cold, what else can they do for them? Parents should also ignite the spark of wisdom in their children's hearts. This book collects the most wanted and interesting questions from over 10,000 children, teachers, and parents, and presents accurate, simple, and vivid answers from scientists.