This document discusses different types of claims, focusing on claims of fact. Claims of fact refer to conditions that existed in the past, exist in the present, or will exist in the future. Inferences for claims of fact are based on data, documents, scientific observation, and research. Examples are provided to illustrate claims of fact about the past (leprosy being the oldest known disease), present (cancer not being contagious), and future (climate getting warmer due to global warming). Guidance is given on how to defend claims by clearly stating them, defining terms, and ensuring evidence is sufficient, accurate, recent, and from reliable authorities.