my boss has asked me to check out mri made easy, an interactive dvd narrated by someone who sounds suspiciously like stephen fry, to see if it's useful as a teaching tool. the 'easy' part is a little bit of a lie, but the writers try their level best to persuade you that it's so. "as you may remember from school," the narrator says, "a proton is etc.", and just as you glow with pride at remembering introductory science they hit you several seconds later with the bloch equation. physics is evil.