>each Zettel only contains one unit of knowledge and one only. These units are the atoms to which the principle of atomicity refers. To figure out what the atoms are, it helps when we ask ourselves what we want the molecules that we create from our note atoms to look like. What are the units that have their own address? The answer is: One thought. Basically each note you take needs to have a unique idea, then link them out. Dont have multiple ideas in one note, for organization. When you're working on something that needs to be published it can be collated, into a book or something.