@danluu My family immigrated to the US when I was in elementary school, and I grew up relatively poor here (the CA gov considered our income "very low", some years, "extremely low"). I remember seeing classmates get picked up for doctor/dentist appointments, never realizing that periodic regular health checkups were a thing. I thought you only went to the doctor when you had a disease or something. (I didn't have insurance until my university gave me a grant)