Buffett builds ethos by starting with his mistakes. The letter’s first subheading reads ... Like analogies, comparing abstract numbers to familiar things simplifies complexity.

Editor: The editor of this opinion page allowed a letter to be published ... regardless of one’s political affiliation. NEPA is a wonderful place because of its people. We can have civil ...

that’s people, places or objects, while a proper noun is the name of a particular person, place or thing. Proper nouns always begin with a capital letter, whereas common nouns don’t.