complex questions
Yet another slippery fish to try to wrestle with bare hands. What constitutes complexity? Some relatively simple looking questions turn out to be highly complex: Are there any whole-number solutions to (a^n + b^n = c^n) if (n) is greater than 2?
Then, any number of complex looking questions turn out to be quite simple with a little insight: such as any large product which has a factor that reduces to 0.
What's simple for some people is hard for others, and I would posit that is greatly amplified when you stop comparing humans to humans and start comparing humans to animals or machines...
they can apply experience to new situations without the ability to use feeling as part of that.
We put unfeeling psychopaths in charge of our largest corporations, to maximize profits - a machine might be less scary in the long run.