The importance of metals, particularly iron, and the importance of the discovery of metallurgy can hardly be exaggerated.
Not all humans can be concert pianists. Some humans can’t speak or get out of a wheelchair or remember their daughter’s name anymore. Here we enter into moral and ethical issues.
Is it reasonable that two populations would independently hit on an adaptation by chance?
The failure to understand the gulf that separates humans from animals, and humans from machines, is a source of confusion to rival almost any other.