The human heart emits the strongest electromagnetic field in our body. This electromagnetic field envelops the entire body extending out in all directions, and it can be measured up to several feet outside of the body. Research from the Institute of HeartMath shows that this emotional information is encoded in this energetic field. HeartMath researchers have also seen that as we consciously focus on feeling a positive emotion - such as care, appreciation, compassion or love - it has a beneficial effect on our own health and well-being, and can have a positive affect on those around us.
YouTube video: Science of the Heart