This is fantastic, like an encyclopedia that knows what context you are learning about as you skip pages. Nice work! My minor recommendation is to highlight so

This is fantastic, like an encyclopedia that knows what context you are learning about as you skip pages. Nice work! My minor recommendation is to highlight somehow that the input fields accepts any topic and the suggestions are just random try-it-out topics, it's wasn't immediately clear. Instead of 'write a message' it could say maybe, 'enter a topic to learn about'.