Game Info:
+1 Science for every 2 Citizens in this City.
Strategy:
The Library increases the science output of the city, speeding up the civ's acquisition of new technology. A Library allows the creation of two Scientist specialists from a city's population, increasing the speed at which Great Scientists appear.
Historical Info:
A library is a building housing a collection of books, scrolls, and other written material. Historically, books have been fairly expensive, often beyond the reach of a civilization's poorer classes. The library allows the poor access to the same knowledge as the rich, greatly improving their chances of success and advancement.