Use the Pageviews API to add a feed section showing the most popular current articles on your language's Wikipedia.
Top viewed pages will be timely and relevant, and give readers a way to see what other readers are into right now on Wikipedia. Its a natural fit for the purpose and format of the Explore feed.
Step one is to investigate the current suitability and capabilties of the Pageview API. We can then get into potenitial design and product details.