There is a physician experimented Soul has weight. He come from a scientific point of view that God created the world and given weight to soul. In 1907, Dr Duncan MacDougall done a research on dying people found that a human moment die will reduce its weight by 21 grams. There are many argument that whether it is the last brief. Also does animal will have the same situation when there die. Result is encouraging that only human has a weight loss when the moment they die. It also relate to Christian believe that when a person die. St Michael will response to come and guide your Soul to other place. Some Soul is heavier and some are lighter. The more sins you have in your life will cause a less heavy Soul. Partly, pointing to a multi dimension array when Soul will migrate after the death.