About FactoSphere

FactoSphere explains surprising and useful things, one checkable claim at a time. Every article starts with a claim that can be checked, and ends with the sources so you can check it yourself.

How we research

We work from what the sources actually say and preserve uncertainty where it exists. When the sources disagree, or only hedge, the article says so in a section called "What is still uncertain". We do not present a guess as a fact.

How articles are made

FactoSphere uses AI-assisted research and editorial tools, with source checks, automated quality controls, and additional human review where required. Every article carries the names of its sources, its publication date, and the date it was last reviewed. We change the "Updated" date only when the substance of an article changes. Read more in our editorial standards.

Topics we handle carefully

Government and politics, law, health and personal finance advice are areas where a mistake can hurt readers. We do not publish in those areas without specific approval and extra review.

Corrections

If you find an error, tell us. We correct it in the article and note the change.