When you use data to study people, ask "who gains power with this info?" If it's not the people whose data you are using, there's a problem.
When a company raises big $ claiming a machine learning edge and then you get a note from a recruiter trying to hire someone to build it.
You do not want to be an edge case in this future we are building.
OH: "Code for ease of understanding, because someday the loser who is going to have to work on your code will be you."