What has been an ancient spiritual truth is now increasingly verified by science: We are all indivisibly part of one another. We share a common ancestry with everyone and everything alive on earth. The air we breathe contains atoms that have passed through the lungs of ancestors long dead. Our bodies are composed of the same elements created deep inside the furnaces of long-dead stars. We can look upon the face of anyone or anything around us and say — as a moral declaration and a spiritual, cosmological, and biological fact: You are a part of me I do not yet know.