I think it would be great if, when answering a question, there could be an image associated with it to provide a visual aspect of learning. This is present for some questions, but an expansion would greatly improve the site. The process to implement this might include a link in each question that generates a web search for images of important nouns/verbs in the sentence. After opening in another tab, users could click and drag useful images back into the Duo tab. This could give users a chance to see the words in context of the learning language (similar to the "in context" option at wordreference.com dictionaries). Just a thought to add another level of depth to the experience.