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Cave men used to ... to discuss daily activities.

Inscribing on caves can be compared to .

The first means of distance communication were .

The smoke signal is still used in the Vatican to indicate .

Pigeons were used for long distance communication due to .

Cher Ami, a homing pigeon, was awarded for her service during world war I

Pony express was used to deliver messages and newspapers .

were used at sea during the late 19th century.

In the 19th century ... was the most popular way of long distance communication.

Radio in Latin means ... .

In 1864 James Maxwell showed mathematically that could travel through free space.

In 1894 Marconi made an electric bell which went off .

In 1920 ... began.

In 1876 Alexander Bell invented ... .

Only ... could afford the telephone at first.

PSTN is ... .

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