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Seleucus of Seleucia: discovery of tides being caused by the moon
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re-invented by Samual Johnson (England, 1604)
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made by adding carbon to iron
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made from a tree sap
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The alphabet
simplified learning to write -
canals where bulit to transport water to places that need it.
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Evidence indicates they were created to serve as potter's wheels around 3500 B.C. in Mesopotamia—300 years before someone figured out to use them for chariots.
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The world's oldest leather shoe, made from a single piece of cowhide laced with a leather cord along seams at the front and back, was found in the Areni-1 cave complex in Armenia in 2008 and is believed to date to 3,500 B.C.
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The first bridges made by humans were probably spans of cut wooden logs or planks and eventually stones, using a simple support and crossbeam arrangement.
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floor slabs for huts in Central Europe
