Humans began to rapidly accumulate technological knowledge 600k years ago

More recent history seems to paint another picture - knowledge is quickly gained as cognitive ability increases, and is even more rapidly lost once it diminishes.

Think of not only the replication crisis in science, but also the despair to retain "tacit knowledge" the failure of which often results in outright abandonment and outsourcing to somewhere else.

The technology to land on the Moon seems to be effectively lost. The supersonic airliner is for some reason not available either.

Same happened in Rome, and Rome itself together with Greece rediscovered civilization from a much darker age before them.

In light of that, the idea that any real knowledge could be retained for that long is preposterous.

>>> The technology to land on the Moon seems to be effectively lost.

The technology might be, but not the knowledge. The tech just became obsolete and probably not up to safety standards anyway. I doubt we'd have much trouble recreating a better equivalent if the incentives existed.

We couldn't. It was just a well known example. Writing doesn't help much - the words lose their meaning without people capable of acquiring the knowledge before hand. Whatever you preserve is worthless without the mountain of implicit knowledge that can only be acquired, and not taught. Knowledge is being lost even as elderly workers try to pass their knowledge to new hires with zero success.

> The supersonic airliner is for some reason not available either.

This whole comment shows a solid amount of ignorance of history, but this particular quote is completely preposterous. "for some reason" is money, plain and simple. Just go read the Wikipedia article on Concorde. And there are plenty of supersonic military airplanes, the technology is definitely there.

> Same happened in Rome, and Rome itself together with Greece rediscovered civilization from a much darker age before them.

Did you ever hear about Ancient Egypt?

There were many like Egypt, Egypt was exceptional that it some sort of survived (but actually not really), while the rest got wiped completely. Then a dark age followed.