This is a collection of essays by Asimov for The Magazine of Fantasy and Science Fiction since 1958. In its French root, essay means to try. Michel de Montaigne first tried to express himself, undisguised. Since him, with the aid of printing technology and advent of magazines, essays become part of daily life. It is such a free form that it can be used to express anything, perfectly suits the need for magazines.
What's the title mean? Essentially, he tried to tell us right and wrong are not absolute. When people say "The earth is flat", they are wrong; when people say "The earth is a sphere", they are also wrong, because the earth is not a perfect sphere. However, the second group of people are more close to the truth, so right and wrong are not so clear-cut, black and white. So one of the essay is titled "The relativity of wrong", obviously, the author likes this title, and makes it the title of the whole collection.