How do we know the difference between head-in-the-sand hope and eyes-wide-open hope? One is a killer; the other, a life-giver.

Schools across the country are adopting the "precautionary principle," which means acting to avoid potential harm even before harmfulness has been proven.

A French translation by Andree Mathieu of "Seven Lessons for Leaders in Systems Change" by Michael K. Stone and Zenobia Barlow.