She is twenty-eight years old and has been working in this store for three years.

Every day, she has to touch the backs of more than ten people.
Some are fat, some are thin, some are young, and some are no longer young.
She has developed a skill: judging a person's anxiety type within three seconds.
"You're not sleeping well, right?" — Eight out of ten people will say, "How do you know?"
"Are you under a lot of stress?" — The remaining two will say, "That's true recently."