01Available sources
Substantive corrections
We record the previous statement, the correction, the reason, the date and the person responsible. Retractions and unavailable sources require reassessment of content that depends on them.
02Available sources
Rights for each resource
Public access does not mean unrestricted reproduction rights. Each document, image, instrument and dataset retains its own terms.
03Available sources
Explicit uncertainty
A hypothesis remains a hypothesis. Conflicts and limitations are preserved; absence of evidence is not presented as evidence of absence.