Hmmm….lots of things! Understanding the human brain is proving to be very tricky, as is something like bringing someone back to life, or preventing death. They’re pretty hard to do….
In the same sense as Paul, one of the hardest things to make (in fact we haven’t made it because we don’t really know how) is a living thing. Any animal you can think of, any living thing, we don’t know how to make.
If we could understand how to do that then we would understand how to cure lots of diseases.
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