Bobby Mercer
Junk drawer physics : 50 awesome experiments that don't cost a thing
Junk drawer physics : 50 awesome experiments that don't cost a thing
The Robot Book: Build & Control 20 Electric Gizmos, Moving Machines, and Hacked Toys
Junk Drawer Physics: 50 Awesome Experiments That Don't Cost a Thing
The Flying Machine Book: Build and Launch 35 Rockets, Gliders, Helicopters, Boomerangs, and More
The Robot Book: Build & Control 20 Electric Gizmos, Moving Machines, and Hacked Toys
The Racecar Book: Build and Race Mousetrap Cars, Dragsters, Tri-Can Haulers & More
Junk Drawer Chemistry: 50 Awesome Experiments That Don't Cost a Thing
The Leaping, Sliding, Sprinting, Riding Science Book: 50 Super Sports Science Activities