I tend to agree with almost all your other respondents here, there has to be much more to the pyramids than known by conventional science, and logically they could be much older than previously thought. We know now what a destructive force the drive for profit is, how it literally wipes out the tracks of history. Occam's razor is responsible for an awful lot of things lost. I visited the pyramids around 25 years ago, as a much younger but already seasoned Engineer, when Egypt was a much safer place to visit, and everthing I saw in the pyramids screamed unknown technology. Rectangular shafts cut diagonally thorugh tens of metres of layers of stone with literally lazer precision. That wasn't done with the hand tools that historians claim were used to build the pyramids, and there were more weird questions about all kinds of things. It is generally accepted we still don't, and have never had cranes which could have lifted the largest stones around the sites of the pyramids. There is a mass of expert Engineering opinion that contradicts the conventionally accepted narrative.

In fact we don't even know what they were for. Later civilisations might have adapted them as tombs, but it seems highly unlikely they were built for that.

Their precision geographical alignment is also very interesting, indicating perhaps solar power collection.

I suspect there is probably knowledge tied up there which would rock the foundations of everything we thougtht we knew about the origins of our species.

Graham Hancock actually does have a point, and his expulsion from the established historian community seems to say a lot by itself.