Now, many encyclopedias, such as: hundred thousand whys, the mystery of the world and so on a wide variety, all kinds of books can give us many benefits, our world is so vast, some things in the world, and books h**e, encyclopedia like dumb teachers diligently teach us knowledge. Visible, how useful book! Also, we learn knowledge also want to use in our daily life, to be accurate and determine whether to do so, the rige on! Let us to soar in the sky of knowledge fully!