whatilearned
Read more: http://www.ce.memphis.edu/1101/interesting_stuff/pyramids_in_concrete.html
TIL about the controversial theory that the blocks that the Egyptian pyramids were built from may actually have been made of a limestone “concrete” that was poured in situ, and not, as is generally thought, carved out of a local quarry and hauled up
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*sad alien noises*