Someone’s built a full-up copy of Babbage’s Difference Engine #2, a fiendishly complicated mechanical computer. It ways five tons. Here’s a bit of video about it; hat tip to Brandon. Very, very cool.
The View from the Foothills
A tiny principality in the Commonwealth of Letters
The View from the Foothills 
Extremely cool. I love this, and I don’t even like mathematics.
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