I forgot to write about this topic!
E-book is interesting! I really feel technology is developing endlessly.
However sometime I 'm be afraid of developing everything next to next.
To invent or develop something means to change the new one.
The old things are threw away and the new things are admired.
People tend to forget the attractions of old things after appearing the new things.
Maybe many devotees of books love paper books. I think paper book is easy to skip pages, mark something you want to write and better for eyes than E-books.
On the other hand, E-book is more cheap and light than paper books, kind to environmental and portable thing.
Both of book are great! Yes, we should use the each book cleverly at that time.