As any history book would infer, each era across different geographic regions is shaped by defining qualities of its age.
Some eras may be defined by their shipbuilding, exploration and manufacturing. Still others are defined by their communications technologies: calligraphy, the printing press, radio, television.
Source:
http://www.huffingtonpost.com/dr-stefanie-babst/nato-facebook-collaboration_b_1437764.html
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