Preferred sources
- Peer-reviewed research and PubMed-indexed papers.
- Government science and public-health agencies such as NASA, NOAA, USGS, USDA and NIH.
- Universities, museums and established scientific institutions.
- Specialist organizations when they are the best available authority for a narrow factual question.
What we avoid
Unsourced listicles, circular citations, anonymous “fact” pages and AI-generated claims are not enough to support a factual statement. Wikipedia can be useful for orientation but is not our preferred final citation when a stronger source is available.
Source links
External source links are provided for verification. FactToon does not claim ownership of third-party material and does not reproduce source articles or images.