This is one of the reasons why we need human teachers: http://bentilly.blogspot.com/2009/09/teaching-linear-algebra.html http://bentilly.blogspot.com/2009/09/t

This is one of the reasons why we need human teachers: http://bentilly.blogspot.com/2009/09/teaching-linear-algebra.html http://bentilly.blogspot.com/2009/09/teaching-linear-algebra... more at : http://news.ycombinator.com/item?id=850485 http://news.ycombinator.com/item?id=850485