In June 2023 I attended a workshop in Hasselt, Belgium, organized by a research network on Knowledge Graphs and Data Integration. Linked Data-based systems and declarative SPARQL queries somehow magically do all the work efficiently, but how? For many people, presentations about using Linked Data and SPARQL already seem very technical. But this event went further, it covered the fundamental algorithms that power the Linked Data systems! In this post I try my best to briefly summarize some of the talks and highlight the added value of those fundamental and often behind-the-scenes work.