Nearly four dozen buildings in New York City have their own distinct ZIP code. It isn’t contingent, as you might assume, based on the size or population of a given building, but on delivery zones and routes instead.

Many spider species will eat their own webs as a way to recoup the proteins used in the silk and cut down on the new resources required to spin the next web.

ZIP codes, or Zone Improvement Plan codes, were introduced to the U.S. mail system in 1963 and were expanded to the ZIP+4 system in 1983.