Everyone’s heard the siren of a fire truck as it zooms down the street. But the sounds associated with fire alerts have changed over time. All around the Pittsburgh region, fire stations alert ...

We know the Doppler Effect as the reason why horns and sirens drop in tone as they rush by us. But the Doppler Effect works on objects that are twisting around, too. We’ll tell you how the Doppler ...

When a fire breaks out in Oyster Bay overnight, volunteer firefighters are alerted to the blaze. A text is sent. A radio relays the information. Then a loud fire horn blares through the hamlet. The ...