Juniors at Shadow Ridge High School in Surprise, Ariz., use 3D printers, laser cutters, and a lot of glue to prototype prosthetic arms that solve a variety of problems. It’s a challenge inspired by ...

For most of us, they’re a medical marvel, but for amputees or those born without body parts, prosthetics are a true lifeline. Incredibly, the very first prosthetic known to human history dates back ...