TIL That the reason most people did not smile in old photographs was due to long exposure times, ranging anywhere from 20 seconds to 20 mins the subjects had to hold perfectly still.

https://historyfacts.com/science-industry/article/why-are-people-never-smiling-in-old-photographs/
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1goroo5/til_that_the_reason_most_people_did_not_smile_in/