Ridiculous, not knowing exactly how stoneage peoples carved and moved rocks and dirt around doesn’t mean we don’t know how to move rocks and dirt.

We cannot carve and move rocks and dirt like they did: https://odysee.com/@hiddenincatours:3/megalithic-saqsaywaman...

What do pre-pottery people B have to do with an advanced civilization collectively forgetting how to make a giger counter?

"Advanced civilization"

Every civilisation for the last million years has categorised itself thus, and, yet, here we are without their technology.

We still don't know how the Romans made a concrete that is as durable as it is (and nothing we have is nearly as good)

Isn’t this no longer true? I’ve seen many experimental archaeology documentaries that use a recipe that uses pozzolanic ash and rock from volcanoes in Italy that they show to create the same properties found in Roman concrete. We don’t make concrete with it now because the supply is too limited and the expense of mining it would be greater than making portland cement.

what does artisanal concrete have to do with collectively forgetting how to make a giger counter?

Russians dug trenches in contaminated soil at Chornobyl:

https://www.independent.co.uk/news/world/europe/red-forest-c...

It looks like they collectively forgetting about dangers of radioactive contamination they created just 40 years ago.

Yes - what does civilisations forgetting how to make the best known concrete on the planet have to do with forgetting how to make a GEIGER counter

You cannot even spell the damned name properly.