It was hosted on its own page and was written much like a documentary about the rise and fall of the human race from the perspective of an alien narrator. There were plenty of illustrations to show the various creatures and 'sub-humans'.
Humans advanced and eventually colonized Mars (and other planets) in our system but because the cost of sending things between Earth and Mars was so expensive there was a lot of tension between them. Martian humans evolved to be lanky.
Eventually there were aliens that came by that gene spliced and mutated a lot of humans and dropped them off on various alien planets to study them and such. The story had chapters detailing each of these 'strains' of sub humans (each with an illustration) and how they either died off or regained their humanity (whatever was left of it anyways) and rejoined the galactic civilizations.
One such batch were turned into nothing but mindless pleasure pets that couldn't fathom anything bad. Another group was melded together like an amorphous blob and had to learn to rely on each other.