time line
Communication starts from the day when Human don't know how to speak.They communicate in differe nt ways. Primitive times: Human communication was revolutionized with the Origin of speech approximately 500,000 BCE. Symbols were developed about 30,000 years ago. Petroglyphs: The next advancement in the history of communications came with the production of petroglyphs , carvings into a rock surface. It took about 20,000 years for homo sapiens to move from the first cave paintings to the first petroglyphs, which are dated to approximately the Neolithic and late Upper Paleolithic boundary, about 10,000 to 12,000 years ago. Pictograms: Pictograms were used by various ancient cultures all over the world since around 9000 BC, when tokens marked with simple pictures began to be used to label basic farm produce, and become increasingly popular around 6000–5000 BC. Ideograms: Pictograms, in turn, evolved into ideograms, graphica...