What does it mean when an ambulance has its lights on but the siren is off? Don't worry, it may not be as scary as it sounds.

Ask any Japanese today what an ambulance siren sounds like, and "pee-po" would be their answer. Until 50 years ago, however, all ambulances, fire engines and police cars in Japan made the same ...

When you pull a tab, the thumb-size alarm emits a 120 db sound—as loud as an ambulance siren. Created by a female-led design team, the device is lightweight, easily fits in a small pocket and ...