This episode explores various English idioms using the word "book," prompted by a listener's question about the expression "you can't judge a book by its cover." The hosts delve into the meaning and application of this idiom, discussing its relevance in both literal and figurative contexts, such as judging people based on first impressions. More significantly, they introduce and explain additional idioms like "an open book," "in my book," and "hit the books," illustrating their usage with examples and relatable anecdotes from their personal experiences. For instance, they discuss the concept of "book smart" versus "street smart," prompting a listener poll on Spotify to gauge audience preference. As the discussion pivots to a role-play scenario, the hosts demonstrate the practical application of these idioms in a natural conversation. Finally, the episode concludes by highlighting the value of these expressions in fostering deeper connections and enriching communication, encouraging listeners to incorporate them into their own conversations and to continue the discussion on a related podcast episode.