Wang Yifang, chief scientist and project manager at the Jiangmen Underground Neutrino Observatory briefs visitors on a Photomultiplier Tube used to convert photons into electrical signal, of which 20,000 pieces are used in the cosmic detector located 2297 feet (700 meters) underground in Kaiping, southern China's Guangdong province on Friday, Oct. 11, 2024. (AP Photo/Ng Han Guan)