The Brazil UFOs of 1958 are really a good opportunity to learn something new:

a site with links to papers studying this case

But be careful, those only interested in one particular idea might be disappointed.

Anyone who suggests that UFOs are anything but alien spacecraft soon finds out how it feels to be taken apart by a pack of flesh-ripping religious weasels.
(Peter Brookesmith, Fortean Times, May, 2000)

Wolfgang