[quote=@Mammalia]
<Snipped quote by Etcetera>

-Spectre- Are they really such a recent discovery? Or is there a large amount to learn about them?
[/quote]

Both. I don't think the concept itself is all that new, but there are almost no groups or individuals widely known who have a great deal of information about them. Interestingly, some ancient cultures seem to have some semblance of a knowledge of their existence.