This stunning fact is lost, he regrets, on a generation that has supplanted history's sweep with a feeble-minded relativism that holds "all civilisations as somehow equal".

The young generation, or nursery, USES a semi-space copying collector, and the old, or tenured, generation USES a concurrent mark sweep collector.

So as we sweep top left to bottom right, we see the younger generation who is more likely to write blogs and upload videos to YouTube, to an older crowd who are more likely to be content consumers.