This is called "heuristics" and everyone does this daily (not in a paranormal way). It's aka "common sense." Like everything though, there are wide ranges of skill levels. Some people pay attention to others, consciously or not, and can aggregate and assemble all those clues you mention. Some people pay no attention at all to others, like someone comes into work after a family conflict, stress onbtheir face, not "put together well", and Mr. Its all about me says, "Wow you look terrible." We all know people like that! An astute reader if clues would put things together, sense a hard time, maybe have empathy, then either ease into a kind word or simply give space and say nothing.