Ebooks are presenting a real threat to the world of books. Publishers are simply afraid of this new trend that is going to be even more popular in the future. How do I know this? It is already known that there are going to be special devices released that are allowing people to read ebooks as if they were reading a normal book. The device is going to look like a piece of paper. Additionally websites offering ebooks are more and more popular and even goggle has introduced a special service concerned with them. That is not surprising as most of the businesses are being transported into the world of internet (like music industry, for example). People are more willing to look for such books than to buy one in books store. Ebooks are additionally cheaper than traditional books. Moreover there is a bigger choice of ebooks. I have even saw an ebook concerned with practice theory test. Book explains what kind of tests are they where can you find them and what is the best way of taking practice theory test. I think it will be hard to find such book in traditional form. After all I think that the price of such book would be much higher than ebook thus the publisher wouldnt see a reason for printing it. If only a limited amount of people would be interested in it, he wouldnt earn on it.