83% knows the answer to this question: "Thomas Jefferson was instrumental in the composition of which historic document? "

And do you know the answer to this one? "What year was the link between cancer and tobacco tar first discovered?"

63% knows the answer to this question: "Which is the complete name of former US Secretary of State Kissinger? "

And do you know the answer to this one? "In what Asian city is Tiananmen Square, which became known in 1989 as a protest site, located?"

42% knows the answer to this question: "What is another name for a farrier? "

And do you know the answer to this one? "What is a coloured glass used to emphasise, eliminate or change color or density in a photo called?"

93% knows the answer to this question: "Which North American country is the coldest, on average? "

And do you know the answer to this one? "Which of these states is a peninsula?"

46% knows the answer to this question: "What is Japan? "

And do you know the answer to this one? "Where is the Mississippi River?"

36% knows the answer to this question: "Which English castle was restored at the end of 1997 at a cost of £37 million? "

And do you know the answer to this one? "A January 1973 ceasefire ended American participation in what nation's war?"

46% knows the answer to this question: "What dog is the most popular to race? "

And do you know the answer to this one? "Which South American canal shares its name with a hat?"

85% knows the answer to this question: "Which of these leaders served as Lord Protector of England, Scotland, and Ireland in the 17th century? "

And do you know the answer to this one? "What is the name for the 200-year period of relative peace and prosperity which began with Augustus?"

55% knows the answer to this question: "Who was a framer of the postwar Treaty of Versailles? "

And do you know the answer to this one? "Hussein bin Ali had been king of Hejaz until it was annexed by the ibn Saud family into the Kingdom of Hejaz and Nejd, which now has what name?"

70% knows the answer to this question: "Where is the Sicilian Mafia based? "

And do you know the answer to this one? "What is all the knowledge and values shared by a society?"

44% knows the answer to this question: "Central Park is a famous park in which US city? "

And do you know the answer to this one? "In the US, in which season do deciduous trees shed most of their leaves?"

85% knows the answer to this question: "A waterway called the Serpentine separates Hyde Park and Kensington Gardens in what city? "

And do you know the answer to this one? "Which of these is a parasitic relationship?"