Algodoo

Developed for 18 years
423 million dollars spent
VERY large (goes 56 feet underground)
And built for the one reason…
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the engineers were drunk.
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Despite it being the idea of a bunch of drunk engineers, the thing was built anyway.
An unreasonably large AI system that can answer any question. One question that it can’t answer is why it was given a turret and spears. My guess is as good as yours.