When you or someone you are caring for is seriously ill, it is recommend that you keep EOBs for five years after the illness or condition is alleviated. If you or the patient is claiming or has claimed a medical deduction, keep the explanation of benefits for seven years.
The earliest writing can be traced to Sumer, in Mesopotamia. This system did not use an alphabet, instead it used pictographs which are symbols representing familiar objects. This type of writing was called cuneiform, or wedge-shaped writing. Egyptians used hieroglyphics, also a pictograph system.
Writing. Sumerian writing is the oldest full-fledged writing that archaeologists have discovered. The Ubaidians may have introduced the Sumerians to the rudiments of writing and numerical calculation, which the Sumerians used for calculating and to keep records of supplies and goods exchanged.