On April 1, amateur metal detectorists Katarzyna Herdzik and Jacek Ukowski made a stunning discovery on a Polish beach. Their scanners led them to an ornate 24cm dagger covered in stars and crescent ...

Why would you want to detect metal? Oh, I don't know … maybe you want to find some gold in the ground. You could dig up ALL the dirt, or you could find the location that has the gold before you dig.