the area problem is not just about area. It’s not just about shape or the relationship between distance and speed or anything that narrow. It’s completely general. From a modern perspective, the area problem is about predicting the relationship between anything that changes at a changing rate and how much that thing builds up over time. It’s about the fluctuating inflow to a bank account and the accumulated balance of money in it. It’s about the growth rate of the world’s population and the net number of people on Earth. It’s about the changing concentration of a chemotherapy drug in a
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