A human being: an ingenious assembly of portable plumbing.
When the judge calls the criminal's name out, he stands up, and they are immediately linked by a strange biology that makes them both opposite and complementary. The one cannot exist without the other. Which is the sun and which is the shadow? It's well known some criminals have been great men.
The entire recent history of biology shows that we are, to a remarkable degree, the results of the interactions of an extremely complex array of molecules; and the aspect of biology that was once considered its holy of holies, the nature of the genetic material, has now been fundamentally understood in terms of the chemistry of its constituent nucleic acids, DNA and RNA, and their operational agents, the proteins.
—Carl Sagan in The Dragons of Eden