What causes the holes in Swiss cheese?

More Questions:

What does a philologist study?

In Europe, what are measured in "Paris Points"?

What US city is home to the Bishop Museum?

What two countries share Lake Geneva?

What gas makes up 96 percent of the atmosphere of Venus?

What fish has green bones?

Approximately how many inches are in a meter?

What is Indiana Jones a doctor of?

In which decade did the movie "Casablanca" premier?

What movie directed by Clint Eastwood won an Oscar for "Best Picture" in 2005?

What profession did George Constanza often pretend to be in the sitcom "Seinfeld"?

What was the codename of the Allied invasion of French North Africa in 1942?

The "Harappan Civilization" is also known by what other name?

The Okapi is native to which country?

Who co-produced the song "Summertime" with Will Smith?