<p>➀ A student at the University of Applied Sciences in Hagen, Melanie Welp, has developed a contactless timing system for Paralympic swimming to prevent injury from head impacts.</p><p>➁ The prototype uses an ultrasonic sensor to measure the time at six meters and 50 centimeters before the edge of the pool.</p><p>➂ The system has been tested and shown to be possible without causing injury to swimmers.</p>