Meta's AI agent Muse climbed to the top of Apple's free-app rankings, reviving investor optimism about artificial-intelligence demand and helping drive the Nasdaq 100 Index to a record close on the 22nd. Memory stocks led the advance, reinforcing the technology sector's role in supporting US equity benchmarks. The development adds to earlier optimism surrounding Muse, which had lifted Meta Platforms shares and topped US app-download charts, even as investors continued to assess geopolitical risks, energy markets, US-China relations and the Federal Reserve policy outlook.