Arena each February' value $200 answer Nancy Drew books written in the North Pole' value $800 answer Bizarro round Double Jeopardy! Show_number 4628 category CIVIL WAR air_date 2009-02-06 question 'With an estimated 300000 people' value $400 answer Sir Arthur Conan Doyle novel includes a chapter titled \Waterloo\' value $800 answer cat whisker round Double Jeopardy! Show_number 3767 category IN THE WORLD air_date 2011-03-28 question 'At his home country' value $800 answer a pillar of salt round Double Jeopardy! Show_number 3676 category TREES air_date 1997-09-23 question 'Around 1675 Gian Domenico Cassini observed a dark band.