In order to gain social worker certification and become eligible to work in the field, individuals must earn at least a Bachelor of Science or Bachelor of Arts. A master's degree in social work is usually required for state licensure as a clinical social worker. Some programs offer training in specialized fields.
View full size image. Johannes Gutenberg is usually cited as the inventor of the printing press. Indeed, the German goldsmith's 15th-century contribution to the technology was revolutionary â enabling the mass production of books and the rapid dissemination of knowledge throughout Europe.efore the invention of the printing press â sometime between 1440 and 1450 â most European texts were printed using xylography, a form of woodblock printing similar to the Chinese method used to print The Diamond Sutra in 868.
The Story: Inventor of the printing press, Henne G nsfleisch zur Laden, commonly called Johannes Gutenberg, was born about 1400 and died in 1468 at Mainz, Germany. Gutenberg was the son of Friele (Friedrich) G nsfleisch and Else Wyrich.041 Bi Sheng in China invented movable clay type 1400 Johannes Gutenberg born in Mainz, Germany 1423 Europeans use xylography (art of engraving on wood, block printing) to produce books.