That’s a metal detector, and it detects metal. Typical darwiniac mistake.
You could at least conceivably detect that crap with your nose...unless of course you are a Temple of Darwin fanatic, in which case you wouldn’t pick up on it, because the crap would smell the same as your normal surroundings.
“There are no hypotheses, alternative to the principle of evolution with its “tree of life,” that any competent biologist of today takes seriously. Moreover, the principle is so important for an understanding of the world we live in and of ourselves that the public in general, including students taking biology in high school, should be made aware of it, and of the fact that it is firmly established, even as the rotundity of the earth is firmly established. ~ Herman J Muller