What year was the first pair of stereo headphones produced?

More Questions:

How many degrees of black belt are there in karate, from student to Hanshi?

Lake Champlain is located in Vermont and in which other state?

What European nation still pledges its allegiance to a foreign monarch in its national anthem?

What is the only muscle in the human body not attached at both ends?

What vitamin is milk fortified with in the US to combat rickets?

What TV series, which ran from 2004 thru 2008, was a spin-off from "The Practice"?

Who won a Grammy Award for his album "52nd Street"?

What were the names of Ann Romano's two daughters on "One Day at a Time"?

In the movie industry, what does a Gaffer do?

Who was the the reality show "Survivor" first winner?

What CBS sitcom aired Monday nights at 9 pm, from 1951 to 1957?

What year did James Garfield start and end his presidency?

What was the name of Henry VIII's ship that was raised from the Solent in 1982?

What 21st-century US presidential candidate had a spouse who was president of two colleges?

The Mayflower is famous for being the first ship to transport what to the New World?