There’s a new movement afoot—a whole generation of makers and tech-savvy innovators who excel at making wild and fascinating projects using electronics and found materials. In The Big Book of Hacks, you get a collection of these amazing ideas from the DIY masters at Popular Science magazine—from a theremin you can make for under $15 to a motorized skateboard, from an epic potato gun to a Roomba that waters your plants. It’s never been a better time to be a geek.