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Petroglyphs
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People discovered fire, developed paper from plants and forged weapons and tools with stone, bronze, copper, and iron. This era is divided into two namely Stone Age and Metal Age. Petroglyphs is carvings or engravings in rocks or caves and pictographs represent word or phrases through images or symbols.
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Pictographs
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People used the power of steam, developed machine tools, established iron production and the manufacturing of various products. A telegraph is first used in this era and it is used to transmit messages from a distance along a wire.
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The internet paved way for faster communication and creation of the social network. People advance the use of microelectronics with the invention of personal computers, mobile devices and wearable technology. Voice, image, sound and data are digitalized.
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Invention of the transistor ushered electronic age. People harnessed the power of transistors that led to the transistor radio, electronic circuits, and the early computers. Long distance communication became more efficient.
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