When can you start? generic bisoprolol On 21 December, the crossworld puzzle will celebrate its 100th birthday. During the past century, it has become the most popular intellectual pastime in the world. Two Girls, One on Each Knee is a celebration of the joys of crosswords. Connor sees it as a sociable endeavour rather than a masochistic struggle, and his lovingly-crafted book is redolent of his affection for the puzzle.