Researchers want to study UFOs. How do they collect good data? A number of military pilots testified before Congress recently about unexplained objects seen in airspace. Scientists, including those at NASA, are interested in studying UFOs or, as they're now called, UAPs — unidentified anomalous phenomena. But there's a big challenge; it's difficult to collect the data to draw scientific conclusions. Alan Tu of WHYY's The Pulse reports. This segment airs on November 29, 2023.