In paragraphs 3-4, how does the author make the connection between facial recognition and reading emotions? by explaining how reading emotions is the next step in the field of facial recognition by explaining how reading emotions is the next step in the field of facial recognition by contrasting the importance of facial recognition with the triviality of reading emotions by contrasting the importance of facial recognition with the triviality of reading emotions by evaluating the usefulness of reading emotions for solving problems with facial recognition by evaluating the usefulness of reading emotions for solving problems with facial recognition by describing how techniques in facial recognition can be applied to reading emotions