### 9.1 Information Design

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• Math Help

You can watch the "Wealth and Health of Nations" change at Gapminder.org. Here are some observations about the animation.

• The countries on the graph are color-coded by continent.
• You can hover the mouse pointer over a bubble to reveal the name of the country. When you do this, the life expectancy, income per person, and population will be highlighted.
• You can follow a particular country by clicking its bubble, or by selecting it from the list. (You can also select multiple countries to follow.)

• Consumer Suggestion

• Checkpoint Solution

The four most eye-catching periods in the animation are 1949-1958, 1958-1961, 1961-1978, and 1978-present. The following table summarizes the behavior of China's dot during those pivotal time periods and the reasons why China's dot behaved as it did.

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``` _____     __   __    ______   _    _    __   __
|  __ \\   \ \\/ //  /_____// | || | ||  \ \\/ //
| |  \ ||   \ ` //   `____ `  | || | ||   \   //
| |__/ ||    | ||    /___//   | \\_/ ||   / . \\
|_____//     |_||    `__ `     \____//   /_//\_\\
-----`      `-`'    /_//       `---`    `-`  --`
`-`
```