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 ...

They divided the year up into a system of twelve months, made up of weeks and days. It may also surprise you to know that the way we tell time is based on Babylonian mathematics, that all ...