Fact-checking policy
Two sources before publication. Public corrections after.
Adopted 1 July 2025 · Last reviewed: 2026-07-02
The two-source rule
No answer is published unless it is confirmed by at least two independent, reputable references. Where two strong sources disagree, the question is reworded to remove the dispute or the dispute is disclosed in the explanation.
Preferred sources
In order of preference: primary bodies (sports federations, standards organisations, space agencies, national statistics offices); major reference works and encyclopaedias; and established news organisations with corrections policies of their own. User-editable sources may start a search but never finish one alone.
Dated facts
Facts that can change — record holders, counts, officeholders — are tagged with a verification date and re-checked before any reuse in a new edition. Archived editions state facts as verified at publication.
Corrections process
Reported errors are re-verified against the original sources plus at least one new one. Confirmed corrections are made on the page, dated, and summarised in the page footer's update note. Substantive corrections are additionally listed on the blog.
Reporting an error
Email via the contact page with the week stamp, category, and question number. Corrections take priority over all other correspondence.