Answer: um im guessing this is late?
Explanation:
The researchers can conduct a blind experiment where the participants don’t know who receives what’s being tested.
Macbeth knows that Macduff's loyalties don't lie with him, this makes him angry and so he sends his murderers to kill Macduff's family.
The author, Isaac Asimov, is trying to teach us through this story
The Three Laws of Robotics, which were obviously devised by him so that men of the future will be able to have humanlike feelings. As examples of this author's intention it is worth to mention what the robot expresses through the story:
"One would like to have more expression,"
"One has thoughts and feelings that presently do not show."