What is a piece of writing that is usually short and on one subject?

How long is 'Gadsby' the longest book written without the use of the letter E? What is the definition of the word implish? What is a fallen hero? What are semantic problems? What is consistent verb tense? What do you call A man who performs courageous act? How can you convert text to braille? What is the setting of the book 'The Truth about Forever'? What are intonation patterns? What is the meaning of obey first before you complain? What is the difference between direct and indirect speech? What is the antonym for wild? The sequence of events in which each event results from the previous one and causes the next? What is the definition of endore? How do you pronounce El Al? What is the verb phrase in Have those socks been washed in the last month? Why is the word dictionary in the dictionary? What is a antonym for always? The meanig of dis in dissension? What is the meaning of wind span and weight span?