“Whenever I wake up it is there and it is unbelievably loud. When nobody else can hear it you think you are going nuts, and it just wears you down,” says Simon Payne, 55, from Cambridgeshire. Payne is ...

Scientists have recorded the mysterious sound of the Earth deep underwater for the first time. The eerie hum could be key to understanding the makeup of the planet itself—but no one knows what makes ...