Building the pyramids, the only surviving of the 7 wonders of the world, was arguably the greatest project undertaken by man.
The 5000 year mystery can be explained in 5 minutes and is remarkably simple, though not obvious.
No human would have started such an undertaking without confidence of success.
That confidence was a machine mentioned by the historian Herodotus.
We now have a working scale model of such a machine.
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C 2004 Gerry Westmacott
500 HP engine