If you could choose only two things as a staple of any war movie, they'd probably be military jargon (like "roger" in military aviation) and hand signals. Whether it's Easy Company deep behind enemy ...

Turn signals are one of the earliest automotive safety features. In the early 1900s, some cars came with mechanical arm "trafficators" that would pop out of either side of the car to indicate a turn.

If you've ever looked outside an airport window while waiting for your flight to get underway, you've probably noticed the ground crew using hand signals. These hand signals are not just a means of ...