If you want to know what a cover-up (and the conspiracy that creates it) looks like, then read this dynamite post on the Watts Up With That website. I've not done my usual trick of ripping the whole thing and copying it here - for one thing, it's too damn long for that!
Suffice to say, as smoking guns go, this one is red hot and billowing. It might be pretty long, but it's an utterly worthwhile - and pretty shocking - read.
Hat tip (again): Bishop Hill.