The Tree of Life is a mystical concept alluding to the interconnectedness of all life on our planet. This tree, in the form of ten interconnected nodes, is an important part of the Jewish mystical tradition of Kabbalah. A representation of a tree is used in genealogy to distinguish familial relationships and in biology to group animals into related units. The scientists who first employed this arboreal motif may have been on to something. When greatly magnified, the twisted helix structure of DNA, which carries our genetic identity, appears to have the solidity of a tree trunk.