As the adoption of knowledge graphs grows, more and more non-experts users want
to explore and query such graphs. These users are often not familiar with graph
query languages such as SPARQL, and may not be familiar with the knowledge
graph's structure. We provide a summary of our work on a language and visual
interface -- called RDF Explorer -- that helps non-expert users to navigate and
query knowledge graphs. A usability study over Wikidata shows that users
successfully complete more tasks with RDF EXPLORER than with the existing
Wikidata Query Helper interface.