A photic sneeze is often caused by what stimuli?

More Questions:

Before starting to make cars, what was Toyota's first product?

'Entry of the Gladiators" is best known as the song that is heard when/where?

In 1939, Buck Ewing became the first Major League Baseball player from what position elected to the Hall of Fame?

What comic strip character’s favorite baseball player was Joe Shlabotnik?

Who composed "5th Symphony"?

Which Parisian venue host the debut of the 1875 opera "Carmen"?

What is the capital of South Africa?

On what continent would you find the Great Victoria Desert?

What is the city of Brotherly Love?

What artificial sweetener based on sucralose was introduced in 1999?

Who played Mr. Orange in the movie "Reservoir Dogs"?

In season 13 of the TV show "Big Brother" what is the name of the alliance that included Dominic, Cassie, Keith and Lawon?

Who won the Oscar for Best Director for the 1987 film "The Last Emperor"?

What instrument does Jack White play in the band White Stripes?

How many points did the Dow drop on "Black Monday" in 1987?