Michael Pollan has some good advice for writing about nature and science. "So choose your first person deliberately. Too many newspaper first persons -- and a lot of magazine first persons too -- are written in the voice of the neutral feature-writer. They're the voice of the Journalist. That is the least interesting first person you have. Nobody cares about journalists. They're not normal people. So choose a first person that draws on a more normal side of your personality. And think about which one will help you tell the story. You'll see that in very subtle ways it will shape your point of view and your tone and unlock interesting things."
