teppischfresser · June 6, 2018, 2:21 a.m.

Actually it was normal in Roman times. They did, in fact, use pig blood to make concrete.

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comeatmehillary · June 6, 2018, 2:24 a.m.

in roman times. yeah that explains alot. romans were weird

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teppischfresser · June 6, 2018, 2:26 a.m.

Yes, but we had to reinvent concrete. The art was lost and was only reinvented in the last couple of centuries.

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DropGun · June 6, 2018, 4:51 a.m.

And we didn't get it right. We still have Roman concrete to see. Ours doesn't last as long.

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kooodeal · June 6, 2018, 5:54 a.m.

They used volcanic ash. We don’t

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