As a kid I'd often visit the beach with my grandparents, just to peacefully watch the waves crash for an hour or so, and maybe look for sea glass or rocks that I'd later find were only pretty when wet from the sea water. On these trips we'd often see a man or woman slowly walking down the beach with a metal detector, smoothly hovering the thing over the sand. It was fascinating. I'd imagine what they would find - old coins, perhaps - maybe in a treasure chest, abandoned by the nonexistent pirat…