How Did They Run Ventilation Systems in the Old Days?
I had to buy air filters for the house this weekend. There's a central fan that moves the air around. Why, I have no idea. When the house was built 90 years ago, people had to move the air around the old-fashioned way, perhaps by filling balloons upstairs and emptying them in the basement. Or they hired neighborhood kids to be "zephyr boys," running around the house flapping leather wings.I thought they used draft animals back then.
Disclaimer: The same pun can be found in Tatja Grimm's World by Vernor Vinge.