CLAIMS that Egypt's ancient pyramids are made of poured concrete have been slammed as an insult.
French magazine Science and Life said tests showed they were built from man-made blocks moulded from cement.
But yesterday Egypt's antiquities minister Zaho Hawass said the theory was "plain stupid".
He added: "Of course they're not. They're made from solid blocks of quarried limestone.
"To suggest otherwise is idiotic and insulting.
"I heard this from a Frenchman before, 20 years ago. It is as ridiculous now as it was then."
The magazine said: "Examination of the stone shows they could have been made from a kind of early concrete and poured into blocks."
But US expert Mark Lehner said: "All studies of the stone have shown they are made mostly from limestone but also from basalt and granite mined in the region."
He added: "How did the French take samples for their tests without the Egyptians' permission?"