What causes the holes in Swiss cheese?

More Questions:

What is the name of the six-pointed star which is the symbol of Judaism?

What type of building or facility gets its name from the Greek meaning "to exercise naked"?

In what country was the first coin operated slot machine invented?

In the US, the horn of plenty is a common symbol of which holiday?

In what decade were the books of J.R.R. Tolkien's "Lord of the Rings" trilogy first published?

What city is overlooked by a large statue named "Christ the Redeemer"?

What islands are home to most of the world's blue-footed boobies?

What is the name of the Austrian Monk who formulated the basic laws of genetics?

What is the name for the longest side of a right-angled triangle?

Who played the role of TV's C. J. Parker?

What movie's first sequel featured the subtitle "On the Move"?

What former NFL quarterback was Bob Dole's running mate in the 1996 presidential election?

What part of the atom has no charge?

Who directed the 1998 film "Lock, Stock and Two Smoking Barrels"?

Who was the first to play the role of James Bond in the series of films?