Visible speech or writing is one of humankind’s greatest inventions. Found in clay tablets from ancient Sumer in Mesopotamia and slightly later tablets from neighboring Iran (ancient Elam) – a partially deciphered script known as proto-Elamite details lists of raw materials and products, such as barley and beer, lists of laborers, and their tasks, lists of fields and their owners, the income and outgoings of temples etc. All calculations concerning production levels, delivery dates, locations, payments and debts. Read more…