Plasma as "the fourth state of matter." This notion, whilst popular, is wrong! Plasma isn't a "state of matter" at all. Plasmas can be found as solids, liquids and gases e.g. respectively, solid metals, liquid metals and ionised atomic hydrogen are all plasmas.
The attempt to explain major results about plasmas and classical electromagnetism in just a few pages without diagrams is, I suspect, not good for general readers.
Some Biblical and ancient Chinese documents contain very opaque passages that some allege describe aurorae; I find that interpretation entirely unconvincing - they're so vague as to be impossible to concretely ascribe any phenomonological interpretation to them. The notorious auroral noise is also mentioned. There's no sound evidence that this phenomenon is real. All claims in favour of it are amateur and unsound.