I took a history of technology class and was shocked to find out how modern the turn of the last century was. In my head I guess I vaguely used to think electricity, radio, etc, was invented in the 1920s-1930s. I was shocked to learn stuff like electric street lighting being deployed in the. 1880s. And I never realized how extensively people relied on telegraph. Like there was a long time when it was an ingrained part of business communication like email is today.