I was reading A Coffin for Dimitrios (great book), and found a character saying “send me a pneumatique when you get to Paris.” And in fact, there was a series of pneumatic tubes to speed the mail in Paris for over 100 years. Thought it was cool. Here’s the wiki as well.

  • SubArcticTundra
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    15 hours ago

    Prague still has one although it’s not in use any more