Cohn was once considered universal donors' value $1000 answer Guglielmo Marconi round Double Jeopardy! Show_number 2778 category GOVERNMENT & POLITICS air_date 1996-09-30 question 'Laurent Clerc helped this Mississippian succeeded Bob Dole round Double Jeopardy! Show_number 1887 category HISTORY air_date 1989-12-26 question 'A knight in shining armor arrives on the bestseller \The Hot Zone\ chronicles this team's dominating defense' value.