What is the most populous US state?
California is the most populous US state, with about 39 million people.
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- Why is there an underground fire in Centralia?
“An underground coal fire has burned under Centralia, Pennsylvania, since 1962.”
Reference: Smithsonian Magazine
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Fun fact about relative height
The highest point in Pennsylvania is lower than the lowest point in Colorado.
How big is California's economy?
If California were its own country, its economy would rank among the five largest in the world.