I'm not going to lie, I had to google this but I learn.
This is called: Dowsing and it is a type of divination employed in attempts to locate ground water, buried metals or ores, gemstones, oil, grave sites, and many other objects and materials without the use of scientific apparatus. It as used a lot in the past, especially in agriculture to locate water... Cool, huh?
SHARE if you knew what this was.....