"If you could download the knowledge of a single book into all human minds, which book would you choose? (Assume magical translation)"

'Flatland'-Mengsen.

Encyclopædia Britannica or, if it is allowed within the scope of this question [1] I'm trying to imagine a word where people would be so much more knowledgeable. I want to believe developing countries would pick themselves up pretty quickly. How many more world problems would be solved almost over night? How close would you come if everyone had a tablet that could search among wikipedia articles in an efficient way? -Oskar