Which part of the human eye controls the size of the pupil?

More Questions:

How many players are there in a standard quidditch team?

What product used the advertising slogan, "Where's your moustache?'

How many points is a bullseye worth in dArts?

What Emily Bronte novel features Heathcliff?

What author created the character of Tom Hagen?

What river flows through the city of Little Rock?

The path known as "Silk Road" stretched for 4,000 miles from China to where?

Which US state shares a border with the Canadian province of New Brunswick?

Pitchblende is the primary source for which fuel?

What disorder's name is derived from the Greek for "without appetite"?

What film won the oscar for best visual effects In 1984?

When did the "Eighty Years War" start?

Who was president when the agency that would become the FBI was created?

What are the nicknames of the twin sisters who work as enforcers for Darcy Parker, in the "Strangers in Paradise" comic series?

Within the English language, what author has the most published books?