Think politics, think economics, think unproven science.
Then there is expertise. Expertise is based not simply on knowledge, but also on experience. I have a great admiration for expertise.
A post by Uncle Skip reminded me of this. https://lionskip.blogspot.com/2018/08/patience.html
Years ago I had to install and hang a heavy chandelier over my dining room table. It was a hot day, I was home from work and tired. It seemed like a simple job. I knew what wires to connect correctly, but that process with hanging such a heavy object by myself was difficult. Difficult is an understatement. I spent about an hour and made zero progress, I was sweating profusely and was more than a little frustrated. I may have voiced my frustration in language that was not acceptable in polite company.
It was the front door. My brother-in-law stopped by from his work to pick something up. He saw me sweating and saw I was frustrated. My B-I-L was an electrician.
“I wonder if you could give me a hand.”
B-I-L surveyed the project.
“Sure. Can you get me a beer?”