The internet...er.... the hospital is a series of tubes!

Way cool. In a similar vein (oops, sorry, medical pun), I was once on the recommissioning ceremony of the USS New Jersey in Long Beach, CA in 1981. Huge hulking WWII-era battleship, with monster 16-inch guns. When it came time to upgrade the mechanical calculators that figured range and distance, they considered electronics and computers, but realized that mechanical calculators are immune to EMP and thoroughly reliable. They kept them. Cogs and gears are hard to jam electronically.
 
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