Abelson: I'd like to welcome you to this course on computer science. [Writes COMPUTER SCIENCE on the blackboard.] Actually, that's a terrible way to start. Computer science is a terrible name for this business. First of all, it's not a science. [Crosses out SCIENCE on the blackboard.] It's a... It might be engineering, or it might be art. But we will actually see that computer so-called "science" actually has a lot in common with magic. You will see that in this course. So it is not a science. It is also not really [crosses out COMPUTER] very much about computers. And it is not about computers, in the same sense that physics is not really about particle accelerators, and biology is not really about microscopes and petri-dishes, and it is not about computers in the same sense that geometry is not really about using surveying instruments.