The fireworks are over and the grill has cooled, but if you’re still feeling patriotic after July 4th, here’s a challenge: See how well you can draw the outlines of all 50 states from memory.

How do you best represent the complex New York City subway system on an easy-to-read map? That's a challenge John Tauranac has been working on since the 1970s, when he chaired the MTA's subway map ...