Great Mystery of How Ancient Egyptians Built The Pyramids Finally Appears Solved

I thought they already knew they built them out of big rocks

To everyone saying the Great Pyramids were built by slaves, no, that's a misconception and was accepted historic fact in the past but has been amended.

From the Wikipedia article on Egyptian pyramid construction techniques:

The Greeks, many years after the event, believed that the pyramids were built by slave labour. Archaeologists now believe that the Great Pyramid of Giza (at least) was built by tens of thousands of skilled workers who camped near the pyramids and worked for a salary or as a form of tax payment (levy) until the construction was completed, pointing to workers' cemeteries discovered in 1990. For the Middle Kingdom pyramid of Amenemhat II, there is evidence from the annal stone of the king that foreigners from Canaan were employed.

... Evidence suggests that around 5,000 were permanent workers on salaries with the balance working three- or four-month shifts in lieu of taxes while receiving subsistence "wages" of ten loaves of bread and a jug of beer per day. Zahi Hawass believes that the majority of workers may have been volunteers. Most archaeologists agree that only about 4,000 of the total workforce were labourers who quarried the stone, hauled blocks to the pyramid, and set the blocks in place. The vast majority of the workforce provided support services such as scribes, toolmakers, and other backup services.

Link to the Wikipedia article: https://en.wikipedia.org/wiki/Egyptian_pyramid_construction_techniques#Great_Pyramid

So they think they have solved one small side aspect of the whole puzzle.

Not exactly what the title promised.

Lots of fun infographics/data at the studies link, contained in the article.

I love how people act like its sooo easy to float 2 ton blocks on a tiny fucking raft . Sure they did... now lets see if we can replicate it

Spoil alert: slavery. The river was the transport, but slaves did nearly everything else.