Mog, a young boy living during the Stone Age, discovers words and language and teaches his fellow cave dwellers how to talk, thus altering the course of history.
Discusses the words various languages, including English, Spanish, Chinese, and Hebrew, use for such sounds as a dog's bark, a train's whistle, and water dripping.
When Max cuts out words from magazines and newspapers, collecting them the way his brothers collect stamps and coins, they all learn about words, sentences, and storytelling.