I listened to that book on CD. It has had a powerful effect on me.
"So we have a paradoxical situation. Proteins can't exist without DNA, and DNA has no purpose without proteins. Are we to assume then that they arose simultaneously with the purpose of supporting each other? If so: wow."
That's a profound statement that makes you realize that only God could have made it happen. And Bryson says it in an understated way. A great storyteller.