What is the main lesson of Shadow Spinner book?

Which of the following words best describes gregors life as expressed in this passage a.) excitingb.)surprisingc.)satisfying d.)demanding

What is meant by “eternally burning black pipes”? what is this implying about the personality of the firemen?

How can behavioral science be applied in improving public health? a.by tracking a disease to determine its sourceb.by creating promotions that improve health habitscboth by tracking a disease to determine its source and by creating promotions that improve health habitsd.neither by tracking a disease to determine its source or by creating promotions that improve health habits