By Tom Senkus Perhaps you’ve seen them on a stroll through your neighborhood. Housed in what appears to be a posh birdfeeder that could douable as a listing on Airbnb are miniature libraries, often with the tagline, “take a book, leave a book.” Inside are often a large number of books: used paperbacks, children’s magazines and best-sellers, all looking for curious readers and a temporary new home. If a book in particular strikes your fancy, simply take it. No library card needed. These free community book exchanges are more than a way of dumping off your old books. They serve ...