Kathleen Spracklin addresses a question from a listener, Dan, about managing facts in a Zettelkasten system. Dan is concerned about the potential clutter from using directory cards when multiple child cards stem from a main card. Kathleen suggests that main cards should focus on ideas, not facts, to prevent the system from becoming overwhelmed with directory cards. She demonstrates this with examples from Carmen Simone's book, illustrating how facts can be included on the back of main cards or left on bibliography cards. This approach keeps the Zettelkasten streamlined and ensures that the main cards remain focused on conveying ideas, which are more engaging in discussions. Kathleen also explains that even with multiple child cards, the system won't be clogged with directory cards if facts are managed properly. She encourages users to experiment with different methods to find what works best for their Zettelkasten.