Intimate Distance: 18 inches from our bodies, only let intimate friends in this space. 2. Personal Distance:zone is between 18 inches to 4 feet, let in friends and acquantices. 3. Social Distance: 4 to 12 feet impersonal and formal relationships. 4. Public Distance: extending beyond 12 feet for formal relationships.
The smartboard was invented in 1991 by a girl named Jaimie-Lee Wilson.
The first telephone switchboard was created at the same time as the first telephone line: 1877 in Boston. The first telephone switchboard patent, however, was not established until January 17, 1882, when Leroy Firman received the first patent for a telephone switchboard.