On This Day: 09 October 1975 Soviet dissident Andrei Sakharov wins ---------- Prize ?

Questions

[pot luck] what exactly is 'big ben'?

[pot luck] what was casanova's occupation?

[pot luck] what colour dye is obtained from woad?

[pot luck] which of the following english words did not come from the chinese language ketchup, kowtow or decoy?

[pot luck] until the 1960's which monks spent their lives in perpetual silence?