Get ready for the coolest issue of Make. Our special kids issue is filled with exciting and fun projects to make your weekend or science fair a blast. Hydrogen rockets, catapults, electric animals, chemical batteries, flying bird automatons, and more await you in the pages of Make: Volume 20! Make continues to be a leader in the tech DIY movement due to its uncanny instinct to engage the curiosity, vitality, and passion of the growing community of Makers - DIY enthusiasts, hobbyist engineers/designers, and others who like to tweak, disassemble, recreate, and invent cool new uses for technology in amazing projects they undertake in their backyards, basements, and garages.