the persians invented many things. One of them was a canal that was put in an angle so that the under ground water would seep through. then they made a bridge made out of boats then they were held in place by ancers then strong string holding togetherthe boats tight. then they put on would planks and dirt. they built two of those. the biggest they built was a road that was mostly compressed rock. and every 18 miles was a rest stop like an Inn. the scientific discovery was the canal that took ground water and brought it up. I talked about this in the top paragraph. also the bridge of boats is a scientfic discoveries. They wrote in Arabic.
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