communication

By 22tijone
  • carrier pigeons
    300

    carrier pigeons

    carrier pigeons were invented 1150 AD ago
  • smoke signals
    400

    smoke signals

    smoke signals were invented 150 BC ago.
  • postal service
    500

    postal service

    postal services were invented 550 BC ago.
  • cave paintings
    Aug 10, 1000

    cave paintings

    cave painting were invented 33,000 bc ago.

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