Rhodomagnetism and Reality

The imaginary science used in The Humanoids by Jack Williamson included rhodomagnetism, magnetism in the next shell up from the ferromagnetism of iron and similar metals. In the real world, we find magnetism from the next shell, but it's manifested in the rare earths. The real-world version is also less spectacular. You don't get superluminal communication; you just get extra-strong magnets.

In a related story, there are also magnetic phenomena of the shell in the other direction, manifested in oxygen.