In the same way that a garden is a rich and intertwined ecosystem where plants, air, soil, birds and bugs interact to grow and reproduce, today's emerging information landscape is an info-system, where content is produced, published, accessed, consumed, discussed, re-mixed and re-published. To be a "master learner" -- to be a teacher -- today, you must learn to work the info-system in order to cultivate new knowledge and skills from a continual flow of information. This book is a guide for teachers who seek to model for their students the practices of lifelong learning.