The document discusses the use of open data sources for visualizing science, specifically through the tool VOSviewer, which supports various bibliometric networks and data sources like Web of Science and Scopus. It highlights different types of networks, including co-authorship and citation networks, and mentions a demonstration based on journals and data from 2007-2016. The document also outlines a wish list for improving open data sources, focusing on expanding publication coverage and enhancing metadata accessibility.