Do helicopters need more or less energy to stay in the sky than an airplane? What pushes a rocket to leave the atmosphere? Why can airplanes have smaller motors

These colorful, easily assembled spaceships require neither rocket fuel nor dilithium crystals ? just scissors, tape, and paper clips. Best of all, they really

This title features simple step-by-step illustrated instructions for making 16 super-sized paper planes. For all ages and three different skill levels.

This book teaches the reader to build rockets--powered by compressed air, water, and solid propellant--with the maximum possible fun, safety, and educational ex

Paper airplanes as serious science? No longer shamefully relegated to the back rows of elementary-school sports stadiums, paper airplanes come into their own wi