Last month, key federal data sets were removed from government websites following actions by the Donald Trump administration, and researchers rushed to preserve the information. David Van Riper of IPUMS, an organization dedicated to improving public access to government data, talked to “Marketplace” host Kai Ryssdal about the importance of these statistics. Plus, Walmart expands and diversifies, ChatGPT has lots of rivals as well as a huge user base, and the U.S. solar industry adapts without Biden-era tax credits.