Have you ever noticed that what is thrilling on Monday tends to become boring on Friday? Even exciting relationships, stimulating jobs, and breathtaking works of art lose their sparkle after a while. People stop noticing what is most wonderful in their own lives. They also stop noticing what is terrible. They get used to dirty air. They stay in abusive relationships. People grow to accept authoritarianism and take foolish risks. They become unconcerned by their own misconduct, blind to inequality, and are more liable to believe misinformation than ever before.