Corrections Policy
Report an incorrect measurement, calculator problem, chart mistake, confusing sentence, typo or broken page. Specific reports are the easiest to check.
What happens to a report
The editorial desk checks the affected page, underlying formula and related guidance. A confirmed factual or functional error is corrected promptly. Differences of convention are clarified when both usages are legitimate.
What to include
Share the page address, the value or wording in question, what you expected and the units used. Please do not send passwords or private account information.