Which scientist wrote the Principia Mathematica in 1687?
Who founded Microsoft with Paul Allen?
What is the square root of 144?
Which naturalist wrote On the Origin of Species?
What is the atomic number of carbon?
How many seconds are in an hour?
Which country is home to the Taj Mahal?
What is the capital city of Kazakhstan?
Which chemical element has the symbol Ag?
What is the capital city of Morocco?
Which chemical element has the symbol K?
Which planet in the Solar System is known as the Red Planet?
What is the capital city of Brazil?
In what year did Twitter launch to the public?
In what year was Apple Computer founded?
In what year did World War II end?
What is the atomic number of carbon?
How many keys does a standard full-size piano have?
