Dr. Bonnie Bassler of Princeton University wants to change the way you think about bacteria. The very word probably makes you grimace and search the depths of your purse for hand sanitizer, but I believe Dr. Bassler can help you overcome this prejudice. Step one is accepting that you are, by her calculations, only about 10% human. The rest of you, inside and out, is a bacterial world, and you are a bacterial girl... so to speak. Sound unbelievable? Trust her -- she's a scient