Read him on the internet some years ago, and lost all reference.
He glossed over the future history of humanity, going fully to the Big Crunch. At one point there was a glacial age, and people had some kind of talking cows that were "milked" for meat. Then humanity was somehow hibernating, and a population of some kind of homunculi lived within the hibernating bodies with a lifespan of 24 hours, and an adventurous homunculus starts an odissey through the body. At some other point people were shepherding stars to defend themselves against a collapsing universe.
I think the author was British.