You know the sound: It's eerie and echoing, and it makes the little hairs on your arms stand up immediately. So many horror movies use it to create a chilling atmosphere, and even some reality shows ...

Space is silent, or so we’re told. In the vast vacuum between stars and planets, sound waves can’t travel as they do on Earth. But what if that silence is just an illusion? What if the cosmos is ...

Add Yahoo as a preferred source to see more of our stories on Google. During ritual ceremonies, the ancient Aztec civilization used a “death whistle” — a haunting instrument shaped like a human skull.