Question: Where/what is the hardest thing on earth to program into a computer?

Brian Weaver answered on 7 Mar 2019:

I say intelligence. Computers do what they’re told. True, there is machine learning, but does that qualify as intelligence? Not to me, not yet anyways.
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Historically, I say the hardest thing to program was the guidance computer for NASA’s early missions to the moon. It was written when computers were the size of a room using “assembly language” (hard for humans to read – easy for computers to read). The printed version of that program is shown next to the programmer in this article: http://news.mit.edu/2016/scene-at-mit-margaret-hamilton-apollo-code-0817.