A Chinese astronaut has reported hearing a strange “knocking” sound in space – and no one is quite sure what it is. The rest of this article is behind a paywall. Please sign in or subscribe to access ...

“The symmetry between those knockings is very unusual,” former Navy submarine Captain Ryan Ramsey said in the trailer Ocean Gate / Handout/Anadolu Agency via Getty Images An upcoming documentary on ...

The mysterious knocking sounds heard beneath the Atlantic Ocean that gave false hope that the Titan submersible and its occupants could be rescued has been revealed in a haunting new audio clip. After ...

What is the knocking sound coming from my engine? What is engine knock? Why is my engine making a knocking noise? Engine knock, or pinging, occurs when a separate pocket of air-fuel mixture ignites ...

So I was at a stop on this back road, and as I went foward and turning right, I hit a small but fairly deep pot hole. It made a nasty sound, but I didn't think of it much as I've hit pot holes before, ...

I've got a 6 year old JBL 10" subwoofer (home theater sub, not a sub for a car) that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver. The sound is ...