31% knows the answer to this question: "In what country was the famous artist Leonardo da Vinci born? "

And do you know the answer to this one? "Einstein's E=mc2 equation is known as the theory of what?"

34% knows the answer to this question: "Which major river flows north through Africa and empties in the Mediterranean Sea? "

And do you know the answer to this one? "Islamabad is the capital of which "P"?"

37% knows the answer to this question: "What puzzle won "Toy of the Year" in 1980? "

And do you know the answer to this one? "Who sang the famous song "Woodstock" (1970)? "

58% knows the answer to this question: "Anne Boleyn and Catherine Howard were both wives of what king? "

And do you know the answer to this one? "Which species can be described as a water bird?"

33% knows the answer to this question: "What mountain, which stands at 3,776 meters, is the highest point in Japan? "

And do you know the answer to this one? "Which media personality, the daughter of Whitney Houston and Bobby Brown, passed away in July 2015?"

80% knows the answer to this question: "Which of these US cities has hosted the Summer Olympic Games? "

And do you know the answer to this one? "What is the name of a formal living room in a house?"

59% knows the answer to this question: "In September 1998 Celine Dion released an album in which language? "

And do you know the answer to this one? "Although known as the father of microbiology and immunology, what scientist got his start in crystallography?"

61% knows the answer to this question: "What was the English King Richard I's nickname? "

And do you know the answer to this one? "What epidemic spread across almost all of Europe in the years 1346-53?"

40% knows the answer to this question: "What war ended on April 30, 1975, when the Viet Cong raised its flag above Independence Palace in Saigon? "

And do you know the answer to this one? "What did London's Whitechapel Bell Foundry deliver in August 1752, in time to celebrate Pennsylvania's 50th birthday?"

35% knows the answer to this question: "Which of these celebrities publically endorsed Barack Obama in early 2008? "

And do you know the answer to this one? "Which of these meals does not contain protein?"

52% knows the answer to this question: "In which bay is Alcatraz located? "

And do you know the answer to this one? "Which is the only continent without snakes or reptiles?"

33% knows the answer to this question: "Which vegetables are named for the capital city of Belgium? "

And do you know the answer to this one? "Which of these is not one of the boroughs that makes up the city of New York?"