because Everything you need to know about one of the world's fastest-growing industries
answer:because it is hard to know about one of the world's fastest growing industries and you have to work a lot.
Hope this helps,Good luck!
they were different,what do you want to know is what you want to think,while what do you want to learn is what you expected. example of what do you want to know: i want to know the kinds of clouds . examples of what do you want to learn: i want to learn about the outer space.