@pbsnews: Boston University space physicist Joshua Semeter was part of an independent panel NASA convened in 2022 to study data related to UFOs, now called unidentified aerial phenomena, or UAPs. PBS News' Casey Kuhn spoke to Semeter about how he used math to explain why one widely-seen UAP video called "GO FAST" was likely an optical illusion. #news #ufo #uap #nasa #math