October 21, 1981 (Wednesday)
- U.S. Patent #4,296,282 was granted to Joseph T. O'Neil, Thomas M. Quinn and Tse Lin Wang for "Incoming Call Identification Arrangement", more commonly known as "Caller ID"
- Born: Nemanja Vidić, Serbian fotballer, in Titovo Uzice
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“The autumnal change of our woods has not yet made a deep impression on our own literature yet. October has hardly tinged our poetry.”
—Henry David Thoreau (1817–1862)