Noise-canceling headphones can’t block out this genius bike bell

Pedestrians wearing headphones who are unaware of their surroundings pose an accident risk for cyclists—especially if those pedestrians are blasting their favorite tunes in noise-canceling headphones that block out the rest of the world. A new bike bell is designed to pierce that bubble. Škoda, a Czech automaker, calls its new DuoBell an analog solution to a digital problem. It’s a mechanical bell, but the company says its the first to engineer a sound that specifically tricks a headpho...