What causes the holes in Swiss cheese?

More Questions:

What color is cerulean?

What country had, at one time, a female "Santa" called La Befena?

Which Batman villain bases all of his decisions on the flip of a special coin?

On what day would you celebrate All Saints Day?

Who wrote the novel "Valley of the Dolls"?

Where did The Wizard of Oz live?

What US city is home to the Gateway Arch?

Which US state's two letter postal abbreviation is "MD"?

In what country is Africa's northernmost point?

What is the second most common element in the Sun after hydrogen?

What is isolophobia the fear of?

In the TV show "The Simpsons', what color is the tablecloth in the Simpsons" kitchen?

Who played the role of TV's J. J. Starbuck?

Who was assassinated by her own bodyguards in 1984?

On what island was Napoleon born?