[Pilton]

Originally Posted by denizen467

Mr Downtown or someone might be able to explain, but why does virtually every north-south artery between Western and Harlem, and many smaller streets also, jog to the right at North Ave? Was the 1871 fire accompanied by a strike-slip fault that tore the north side 10 yards to the east or something? Could this finally prove that O'Leary's cow was really innocent?

An explanation. Don't know how accurate it is.

http://chicago.straightdope.com/sdc20091008.php