Henri Picciotto is a math education author and consultant. He shares his ideas about pedagogy, and much curriculum, on his Math Education Page (http://www.MathEducationPage.org) and his blog (http://blog.MathEducationPage.org). Henri has retired from the classroom after 42 years of teaching at every level from counting to calculus. He is a leading authority on the use of manipulatives and geometric puzzles in secondary school. He has been an enthusiastic (and skeptical) user of electronic learning environments since the early days of the personal computer. every week.