
- The x-axis (unlabeled) is the year.
- The dotted line is an estimate for the future.
- Why does the Chine line dip? Maybe there is some epidemic/war/famine/birth decline.
- Time vs. population is a direct relationship.
- What about the baby boom? How does that affect this (disclaimer: I explained what it was and they were fascinated to find out there is a connection between history and math)