52% knows the answer to this question: "Which variety of the Chinese language is spoken by over a billion people as of 2012? "

And do you know the answer to this one? "What musical, a Vietnam-era updating of Madame Butterfly, was famous for a scene in which a helicopter lands on stage?"

68% knows the answer to this question: "What was the name of the Spanish fleet sent to invade England in 1588? "

And do you know the answer to this one? "The Israeli flag features what six-pointed shape?"

57% knows the answer to this question: "Which of these species is NOT native to the USA "

And do you know the answer to this one? "What is the radio call sign for any fixed wing plane when the US president is onboard?"

44% knows the answer to this question: "Which animal's meat is referred to as mutton, particularly when the animal is an adult? "

And do you know the answer to this one? "Which fruit, used in jellies, juices and wine, is a major export of Italy?"

87% knows the answer to this question: "In 2013, a NASA rover discovered calcium on which planet? "

And do you know the answer to this one? "Who was Joseph Stalin?"

73% knows the answer to this question: "Where were the first Olympic Games held? "

And do you know the answer to this one? "During WWII, the Japanese resorted to a (literally) suicidal method of warfare called kamikaze. What did this entail?"

71% knows the answer to this question: ""Baby seems like we never ever agree" is a lyric from which Paula Abdul song? "

And do you know the answer to this one? "Which 1980 Black Sabbath LP cover features cigarette-smoking angels?"

72% knows the answer to this question: "The seventh and final instalment of what popular book series was released on July 21, 2007? "

And do you know the answer to this one? "Who was Rembrandt van Rijn?"

49% knows the answer to this question: "Neuromorphic engineering develops computers that mimic something. What? "

And do you know the answer to this one? "What was the title of the 1960 #1 hit by Elvis Presley?"

41% knows the answer to this question: "Which Asian country landed a rover on the Moon in 2013? "

And do you know the answer to this one? "In 1982, Argentina invaded the Malvinas. What do the rest of us call the Malvinas?"

59% knows the answer to this question: "Which word is spelled wrong? "

And do you know the answer to this one? "Which word is spelled wrong?"

79% knows the answer to this question: "In Pillow Talk, I play womanizing Brad Allen, who pretends to be cowboy Rex Stetson. At one point, Allen suggests that Stetson is gay. What gay actor played Allen/Stetson? "

And do you know the answer to this one? "A sheepdog, a pony, a goose and breeds of sheep and cattle are named for what subarctic archipelago?"