Newer cars often bring neat tech, like rear–facing cameras and sensors so you don’t back into another vehicle (or a living thing). For anyone driving an older car, it’s not only a matter of envy to ...

Ultrasonics refers to signals that are above the human hearing span (>20 kHz), and usually in the 40- to 70-kHz range. These signals are used like radar—they’re radiated toward a target and reflected ...