#By setting stories on other planets or using other races, the author is often holding a mirror up to our society or to human psychology. What is Asimov saying about us in “Nightfall”?

#Science fiction stories often have to deliver a lot of information to the reader, but don't want to deliver it in a tedious way (i.e. as a dry lecture). Describe and illustrate the techniques used to do this in four of the assigned readings.