A photic sneeze is often caused by what stimuli?

More Questions:

How many balls are normally racked in the triangle in pocket billiards?

'Dig "em Frog" was the mascot for which Kellogg's breakfast cereal?

Author Margaret Atwood hails from what country?

What is the capital of the African country of Comoros?

What object is theorized to lie at the center of the Milky Way?

Whose memory is the movie "Gladiator" dedicated to?

What was the name of John Lennon and Cynthia Lennon's son?

What instrument was played by jazz musician Glenn Miller?

Clarence Darrow was coaxed out of retirement to defend what famous duo?

Where were the 1988 Olympics held?

The Battle of Lexington occurred at the start of what war?

In what decade was the Social Security Act signed into law?

Who did Dwight Eisenhower defeat twice in presidential elections during the 1950s?

What date did the United Kingdom European Union membership referendum took place on?

Animals and plants which produce light are said to be what?