Yang Ping nodded and didn't ask further. He took another walk around the laboratory, glanced at the literature on the bookshelf, checked the experiment log, and finally stopped at the door.
"Has Professor Zhou shown any unusual signs in the last six months?" he asked Li Xiong, "Physically, or behaviorally?"
Li Xiong thought for a moment and said, "Physically… he has lost some weight recently, but it's normal for older people to get thinner. Behaviorally… he seems more silent than before. He used to chat with us when he came to the lab, but he hasn't spoken much in the past six months, just buries himself in experiments."
He paused, suddenly recalling something: "Oh, about two months ago, he asked me a very strange question."
Yang Ping's gaze sharpened: "What question?"
