Scientists say pyramids could be concrete

Scientists are taking a new look at Egypt's pyramids to see if some of the blocks could have been made from concrete.

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<p><a href="http://www.physorg.com/news128167000.html">Scientists say pyramids could be concrete</a></p> <p>Scientists are taking a new look at Egypt's pyramids to see if some of the blocks could have been made from concrete. </p>