For most of human history, dyads and groups were only able to work and play together if they were collocated.  All of this changed in the 19th century, when the first remote collaboration and entertainment technologies — the telegraph, the telephone, and the radio — were developed and widely commercialized.  These were joined in the 20th century by television.  By the middle part of the century, medical images were being transmitted over phone lines; soon thereafter, 2-way television was being used for remote medical consultations.

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