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 printing press was invented by J. Gutenberg sometime between the late 1430s and the mid 1450s. The modern movable type printing press was invented in 1439 CE by Johannes Gutenberg in what was then the Holy Roman Empire.It ushered in the European age of printing.here are other claimants to the invention of the printing press, and there are those who say there is evidence that the press may have been invented as early as the 13th century. Woodblock printing was done in Europe before Gutenberg.