[Shane Ormonde] recently learned how to measure distance using just a webcam, a laser, and everyone’s favorite math — trigonometry. Since then he’s thrown the device onto a stepper motor, and now has ...

Children growing up in the 1950s and 1960s often entertained themselves by playing “cowboys and Indians” with cap guns and rubber arrows. In the 1970s and 1980s, air-powered rifles filled with ...