Date: 2017-07-15 06:49 pm (UTC)
jamoche: Prisoner's pennyfarthing bicycle: I am NaN (Default)
From: [personal profile] jamoche
"as lost as the Roman art of making concrete"

Soo.... about 2000 years later someone will work out what the key ingredient was? http://www.pbs.org/wgbh/nova/next/ancient/mystery-of-ultrastrong-roman-concrete-solved/
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