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A real person reads every message. If you've found an error in a number we publish, that's the message we most want to receive.
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- Corrections. If a figure looks wrong, tell us — ideally with the source you're comparing against. Every number here traces to a citation, so a correction is something we can check and fix fast. Getting the numbers right is the entire point of this site.
- Questions about method. How a calculator works, where a figure comes from, why we made a modeling choice. Much of it is already on themethodology page, but ask if it isn't.
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