David Marshall on Nostr: npub1nw844…f8pu2 npub1kvz9r…9k9es Roman concrete lasts longer. IIRC, it has ...
npub1nw8444hsg0hps2p8nd9cjhhdf7glumralqtny0hx32zvvsxcdjaqaf8pu2 (npub1nw8…8pu2) npub1kvz9r4cuw58r5d7trkpvedmwtxlpm5dt4zss7mda6z2efu4s8agqa9k9es (npub1kvz…k9es)
Roman concrete lasts longer. IIRC, it has something in it that was dismissed by modern science as "impurities".
Until they figured out these impurities actually "healed" broken concrete when exposed to sunlight.
Roman concrete lasts longer. IIRC, it has something in it that was dismissed by modern science as "impurities".
Until they figured out these impurities actually "healed" broken concrete when exposed to sunlight.