54% knows the answer to this question: "What gem sparkles because it captures light and slows it down to about 40% of its top speed? "

And do you know the answer to this one? "Though it takes up only 21% of air, what element do we need to breathe?"

54% knows the answer to this question: "What major invention did Alexander Graham Bell unveil at the Centennial Exposition in Philadelphia in 1876? "

And do you know the answer to this one? "Which is regarded as the most refined of ceramic wares?"

51% knows the answer to this question: "What is the most flexible muscle in the body? "

And do you know the answer to this one? "In 2014 an extinct species of swamp pig was named for what singer, in honour of his equally impressive lips?"

50% knows the answer to this question: "In which country were cuckoo clocks invented? "

And do you know the answer to this one? "In what century did Joseph Stalin achieve fame?"

79% knows the answer to this question: "What film starring Warren Beatty as Bugsy Siegel was released in 1991? "

And do you know the answer to this one? "Complete the name of the this famous landmark in London 'Madame ______'"

30% knows the answer to this question: "What were the Drifters asking you to save for them at No.2 in the charts in 1960? "

And do you know the answer to this one? "What is the name of the song that is considered to be Australia's unofficial national anthem?"

57% knows the answer to this question: "Where are your sinuses located? "

And do you know the answer to this one? "Which of the following is a bird?"

86% knows the answer to this question: "Which form of communication does a bird use? "

And do you know the answer to this one? "In which desert was there no rain for 10 years?"

61% knows the answer to this question: "What seafaring warriors traveled the Oder River in Poland during the Middle Ages? "

And do you know the answer to this one? "What is the condition in which person will not eat, lack of appetite?"

33% knows the answer to this question: "What is a change in the form of a species over time called? "

And do you know the answer to this one? "Which of the following land areas is the largest? "

77% knows the answer to this question: "Which of these continent - country - capital groups is correct? "

And do you know the answer to this one? "What part of a plant produces seeds?"

89% knows the answer to this question: "Which animal has mask-like markings on its face and a ringed tail? "

And do you know the answer to this one? "What type of geography is the land of Afghanistan?"