Lol 4,500 years old, and LOL at the “Egyptians” building them; not even close:
“They found that the tiniest structures within the inner and outer casing stones were indeed consistent with a reconstituted limestone. The cement binding the limestone aggregate was either silicon dioxide (the building block of quartz) or a calcium and magnesium-rich silicate mineral.”
“More startlingly, Barsoum and another of his graduate students, Aaron Sakulich, recently discovered the presence of silicon dioxide nanoscale spheres (with diameters only billionths of a meter across) in one of the samples. This discovery further confirms that these blocks are not natural limestone.”
“At the end of their most recent paper reporting these findings, the researchers reflect that it is "ironic, sublime and truly humbling" that this 4,500-year-old limestone is so true to the original that it has misled generations of Egyptologists and geologists and, "because the ancient Egyptians were the original--albeit unknowing--nanotechnologists."”
"This is not my day job." So begins National Science Foundation-supported researcher Michel Barsoum as he recounts his foray into the mysteries of the Great…
new.nsf.gov
That’s just a government science website saying the pyramids have nanotechnology design in them; it’s an official US gov website.