Have you ever wondered why we stop to watch the orange glow that arrives before sunset, or why we flock to see cherry blossoms bloom in spring? Is there a reason that people -- regardless of gender, age, culture, or ethnicity -- are mesmerized by baby animals, and can't help but smile when they see a burst of confetti or a cluster of colorful balloons? We are often made to feel that the physical world has little or no impact on our inner joy. Increasingly,...