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“Today we experience oxygen in the most intimate exchange. With every breath we take, a tiny portion of the air becomes a part of us, even as a tiny part of us becomes the air. As days pass, our bodies melt away and form again in moment-by-moment chemical reactions with oxygen. Our tissues are replaced over and over again throughout our lives, Earth’s finite store of atoms recycling among air, sea, land, and all its living forms. Most of the atoms that formed your infant body at birth are now dispersed, as your present atoms will be again, if you have the good fortune to live a few more years on this oxygen-rich planetary home.”