Author, astrologer, journalist, satirist, and 'well-willer to the mathematics', Poor Robin of Saffron Walden was a fantastic, yet invented, figure of British popular culture from the Restoration to the end of the Georgian period. Poor Robin's Almanac first appeared in 1662, developing an enthusiastic following and long outliving its original creator to last until 1828. Benjamin Wardhaugh tells the great story of Georgian popular mathematics - through...