Public libraries are among the most important resources in any town. You can earn an entire education in a library — almost free of charge. When Matt Damon’s character in “Good Will Hunting” taunts a pompous Harvard graduate student, he tells him: “You dropped a hundred and fifty grand on a … education you coulda’ got for a dollar fifty in late charges at the public library.” (Expletive excluded.) Many libraries also provide classes for the young , lectures for the elderly, gallery spaces for