Any military airbases feature plenty of ground crew using hand gestures and colorful wands to communicate with pilots. Here's ...

This one starts with your arm raised horizontally, your hand flat (palm down), and your thumb to your opposite shoulder, then sweeping it around to full extension. In both cases, the signal can be ...

“[Students using hand signals] suddenly realized that there were other real ... A wave that uses the entire arm indicates a desire to speak. Arms crossed like an X signal “I have a different view.” ...

Researchers there knew that in most people like Rendulic, the brain is still trying to send signals through the spine to the muscles that control the arm and hand. Marco Capogrosso, an assistant ...

Most bionic limbs are controlled by electrical signals generated by muscles moving near the attachment site. But when an arm is amputated above the elbow, the remaining muscles aren't enough to ...