As a student of history, a side interest is historical trivia which helps explain how human beings got from there to here or other insights into the human condition.
An example is the over 100 year history of the "automobile auxiliary power outlet" AKA the cigarette lighter socket in automobiles. Originally, it began as a cigar lighter in luxury cars. During the Great Depression, cigarettes became more popular than cigars even though the lighter remained wide enough for cigars. Along the way, the device became a de facto DC auxiliary power source. As cigarettes became less popular, the cigarette lighter section was replaced with a plastic plug which still allowed access to the "automobile auxiliary power outlet".
Nowadays, even that outlet is being replaced with USB power sources.
en.wikipedia.org
In the United States, cigarette lighters started appearing in 1925–1926 in some models. They were a standard feature by the 1950s.
An example is the over 100 year history of the "automobile auxiliary power outlet" AKA the cigarette lighter socket in automobiles. Originally, it began as a cigar lighter in luxury cars. During the Great Depression, cigarettes became more popular than cigars even though the lighter remained wide enough for cigars. Along the way, the device became a de facto DC auxiliary power source. As cigarettes became less popular, the cigarette lighter section was replaced with a plastic plug which still allowed access to the "automobile auxiliary power outlet".
Nowadays, even that outlet is being replaced with USB power sources.