A team of scientists has developed a powerful new way to detect subtle magnetic signals in common metals like copper, gold, and aluminium—using nothing more than light and a clever technique. Their ...

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.

Scientists have cracked a century-old physics mystery by detecting magnetic signals in non-magnetic metals using only light and a revamped laser technique. Previously undetectable, these faint ...