A conventional doorbell often uses a physical bell, or a digital equivalent with a rudimentary speaker, to make the ...

Moments before the Philadelphia plane crash, a doorbell camera captured the sound of the Learjet's screaming engines, followed by the blinding fireball. Video provided by Kiara Rios.

With the growing ubiquity of cameras, in our pockets and in our homes, it's not that strange to capture those moments when space rocks streak across the sky and fall to Earth – but a video recorded on ...