Old Babylonian period, between 1900 and 1600 B.C. Related: Mask of Xiuhtecuhtli: A 600-year-old mask of the Aztec fire god taken as treasure by conquistadors What it tells us about the past: This ...

What it is: A cuneiform mathematical clay tablet with an incorrect answer Where it is from: Tell Ingharra, Kish (Sumer), modern-day Iraq When it was made: Old Babylonian period, between 1900 and ...