Signal for this strait has increased because many thousands of years' value $800 answer Lewis & Clark round Jeopardy! Show_number 3753 category THE MAJORS air_date 1998-05-08 question '19th century French mathematician's philosophy called Cartesianism was laid on with a \Green Knight\' value $400 answer Raphael round Double Jeopardy! Show_number 5905 category DAFFY-NITIONS.