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 ...

First-class fliers have a code. It’s subtle and usually comes with a glass of champagne. If you want fit in before you fall flat in a sea of stares, learn the unspoken rules—lest you mistake the amuse ...