Imagine a student in school learning some branch of science or mathematics. The questions this student often has in mind are: Why should I learn this? Why would anyone want to learn this? Why do people who learn this stuff learn it? If they like it, why do they like it? What do people do with this stuff once they learn it? What is it good for? Such questions are rarely answered in school. Most students know not to ask them and many teachers could not answer them if they did.