Trivia Detective Alert: The derivation of airport codes for nearly all major North American cities is pretty straightforward, like SFO for San Francisco and MKE for Milwaukee. The one that has us stumped is YYZ for Toronto’s Pearson International. If you know how Toronto got to be YYZ, please let us know.

According to the World Resources Institute, what world nation has the fewest known native species of mammals?

A) New Zealand

B) Ecuador

C) Portugal

D) Saudi Arabia

Friday’s answer: Edmond Dantes, the title character in “The Count of Monte Cristo,” is a sailor.