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.
It seems the first people who wrote were the Sumerians and the Egyptians around 3500-3200 BC. It is not clear which of those two peoples invented writing first, although it seems the Egyptian writing had some Sumerian influence and not vice versa.