In his introduction to Great Astronomers, Ball states, “The history of astronomy thus becomes inseparable from the history of the great men to whose labours its development is due.” What does Ball mean by this statement? How does this statement relate to the purpose of the text?

Robert was not waiting for her in the little parlor. he was nowhere at hand. the house was empty. but he had scrawled on a piece of paper that lay in the lamplight: "i love you. good-by—because i love you." what significant idea, presented throughout the novel, does robert's final departure and note highlight? edna is ultimately alone in her rebirth. edna needs to find solace in her children. edna will never be truly loved by anyone. edna should not have forsaken her family.