What hinged surfaces on a plane's wingtips allow the aircraft to roll?

More Questions:

By tradition, what can you call yourself if you were born within the sound of London's Bow bells ringing?

What type of salad was invented by the owner of the Hollywood eatery the Brown Derby?

Who wrote the opera "Madame Butterfly"?

What baseball player is Santiago's hero in "The Old Man and the Sea"?

In the novel "Lolita', who was Humbert Humbert obsessed with?

What is the capital of Egypt?

As what is "South West Township" known in South Africa?

Mount Whitney is the highest peak in which mountain range?

Sigmund Freud believed a person’s psyche was composed of what three components?

What dinosaur contemporary has a name meaning "ancient feather"?

In "The Addams Family', what does Morticia do that always excites Gomez?

In The Simpsons, what kind of factory is next door to where the Krusty the Clown show is taped?

Former Yugoslavian leader Josip Broz was also known by what other name?

Where was South Africa's Freedom Charter signed?

On the day George Washington was first inaugurated as President of the United States, how many United States were there?