The science of the ancients was so encompassing,
any one question throws up numerous more,
not only "How did they do it?", but why,
what was the scientific thinking long before the first stone was hew,
much less transported and set in place.
The Egyptian's "preferred granite source came from the Aswan area.",
some 500 miles south in Nubia.
The "casing stones of Giza pyramids" were made from granite,
"Other notable monuments that were quarried at Aswan include
the sarcophagus made from granite at the burial chambers of Djoser and Sneferu at Saqqara,
the Osirion at Abydos, and Cleopatra’s Needle"
"Obelisks all over Egypt" whose "function and purpose is still a mystery"
are all made from granite which "like most natural stones". Has, but
"granites have been reported to have higher radioactivity"
Not only is granite radioactive, it emits the chemical element Radon,
a noble gas which can be carcinogenic
"Radon is produced by the radioactive decay of radium-226,
which is found in uranium ores; and
metamorphic rocks such as granite, and,
to a lesser degree, in common rocks such as limestone",
used in pyramid building,
at the same time it is used in modern medicine, in radiation therapy.
Could it be just chance that the Egyptian science,
built around astrology and "earth sciences",
uses the highly active stone known as the living rock ?