Trust center
Fact-Checking Policy
Our process for reviewing questions, answers, and explanations.
Last updated July 17, 2026
Source hierarchy
We prefer primary sources, government and educational institutions, museums, professional organizations, and established reference works. Dynamic facts are date-stamped.
Question review
Editors verify that each factual question has one defensible answer, plausible alternatives, sufficient context, and a concise educational explanation.
Corrections
Readers can report errors through the contact page. Confirmed errors are corrected without hiding the change.