Assembler,
Absolutely true, Metal Detectors give us a sixth sense. Metal detectors are like dogs! They share a sixth sense and alert us to things we cannot see or otherwise perceive. Much like dogs, metal detectors have different levels of perception. The Malinois doesn't sniff like a hound dog. Sniffing has limited "depth". I'm guessing a Mal has keen perception in their eye-brain interface

where their perception goes into what can only be described as a sixth sense. Our eyes respond to waves in the light spectrum. the electromagnetic spectrum includes everything down to DC. Can there be more?
It is an interesting correlation, metal detectors give us a sixth sense. They too have their unique capabilities and limitations.
- Geowizard