Trivia (singular: trivium) are unimportant (or "trivial") items, especially of information. In the late 20th century the expression came to apply more to information of the kin useful almost exclusively for answering quiz questions: a perfect "trivia question" is one that initially stumps the listener, but the answer subsequently sounds familiar once revealed (otherwise the question would be considered either too familiar and therefore not trivia, or so unfamiliar and obscure as to be unanswerable and not as entertaining). The study or collection of trivia is known as spermology, which literally means collection of seeds.