What you see here is kind of a proof-of-concept of an app, which dynamically generates quiz questions from the DBPedia Linked Open Data knowledge base. DBPedia comprises a huge amount of RDF-organized fact data, mostly originally extracted from Wikipedia. Questions are generated at runtime, involving the DBPedia SPARQL endpoint and another web service responsible for ranking entity properties by their relevance. Due to the expensiveness of the queries and the fact that this is only an experiment and not production-ready at all, generating new questions will probably take very long (up to a minute).