The core curriculum for social worker certificate programs includes a general overview of social work; however, elective courses are also available for additional training in a specific area. Employment Outlook and Salary Information.
Chinese printer Pi Sheng invented the movable type printer in 1041 A.D. In 1440, German inventor Johannes Gutenberg invented a printing press process similar to Pi Sheng's printer. It remained the principal means of printing until the 20th century. Typically wooden bolcks with raised letters were made.
2) The invention of the printing press. In 1440 the printing press was invented which allowed these old scrolls be printed. The printing press was a powerful tool. It allowed ideas to be shared and spread rapidly. The Greek and Roman writings that came in from Constantinople were printed and spread across Europe.