Records were needed to keep track of accounts on trade products and food storage. Created because all of this information became too great. Also, we
needed to express more complex ideas like "belief" and "social order" where
pictures and words simply would not be enough.
Job Specialization
Advanced Cities
System of Writing
Central Government

As you drive in to school, you hear a random radio-show caller arguing that sun exposure really has not been shown to cause skin cancer and that some research suggests that skin cancer is completely genetic and not related to sun exposure at all. at the time, you think that this is a silly argument and that the caller does not know what she is talking about. however, two months later, you are outside without wearing sunscreen, and you find yourself remembering that you had read something about how the sun actually does not cause skin cancer. this process is evidence that has influenced your attitude