Computers can't really replace teachers.The problem with a computer is that it can't provide encouragement and support when a student gets frustrated. A computer doesn't understand when a teenager has had a fight with her mother or boyfriend, when she's up at two in the morning with a sick infant, or when his mother is dying of cancer. You need a human for that. Teaching is not just about subject matter. It's about helping students through the difficult parts of their lives, while making sure they are learning.