Quoting geneticists, Guy Murchie says we're all family. You have at least a
million relatives as close as tenth cousin, and no one on Earth is any
farther removed than your 50th cousin.

Murchie also describes our kinship through an analysis of how deeply we
share the air. With each breath, you take into your body 10 sextillion
atoms, and—owing to the wind's ceaseless circulation—over a year's time
you have intimate relations with oxygen molecules exhaled by every
person alive, as well as by everyone who ever lived. Right now you may be
carrying atoms that were once inside the lungs of Malcolm X, Christopher
Columbus, Joan of Arc, and Cleopatra. (Source: Guy Murchie, *The Seven
Mysteries of Life*)