What is a kid? Good explanation needed.

A kid is, in a broad sense, a minor under the age of 18. In a more narrow sense, a kid is anyone who isn't considered a teenager, usually under the age of 13. In a more symbolic sense, a kid is someone who's innocent, vulnerable, and worry/stress-free.

what are the sentences?

in the quotation from passage, connie willis states that literature is a way for authors from the past to communicate with readers of today. we can read their stories, books, and other texts to learn lessons about life. willis refers to these lessons as messages “from beyond the grave.” willis has a favorable viewpoint about the timelessness of literature.