**6. False. **Though it mutes all sounds, by cutting down wind noise and the motorcycle's mechanical sounds, at speed, a helmet makes it as easy to discern important sounds. Put another way, the signal-to-noise ratio is not changed, the volume is just turned down slightly. In fact, because the wind flows more smoothly over the helmet's surface than your uncovered ear, a helmet may actually reduce the amount of wind noise, enabling you to hear other sounds better. If you are standing at a stop and hear impending danger, it is probably too late to react, whether you are wearing a helmet or not. Reducing noise reduces fatigue and other negative effects too.