NPR Weekend Edition Sunday Puzzle
April 3, 2016
Will Shortz

OLD RIDDLE

The riddle below appeared in the November 12, 1803 edition of the Boston Weekly Magazine and has remained unsolved ever since. Can you come up with an answer that's been waiting for 213 years?

I am both man and woman too,
And go to school as good boys do.

(Possible) Answer:

A ruler