This article is contributed by Heather Johnson, who regularly writes on California teacher certification. She invites your questions and writing job opportunities at her personal email address: heatherjohnson2323 at gmail dot com. Teaching children is arguably the most taxing job in the world -- it demands a great deal of patience and tolerance all through the day, every day of school. A good teacher takes the extra effort needed to ensure that the children understand what's taught, not just in the way of lessons but in the way of life too. Sometimes a teacher's patience is put to the test in the form of difficult students, those who will just not fall in line with the rest of the class. And at