What year did the TV show "Gunsmoke" change its length from 30 minutes to 1 hour?

More Questions:

What fabric derives its name from the French for "cord of the king"?

The single-portion takeout named "bento" originated from which country?

Which of the Seven Wonders of the World was situated approximately 50 miles south of modern Baghdad?

In which continent would you find the Volga River?

What is the Gulf Stream?

What historical woman has been portrayed on stage and screen by Faye Dunaway, Elaine Paige, and Madonna?

Who played the role of Jim Stark in the movie "Rebel Without a Cause"?

In The Simpsons, who developed a serious slot-machine gambling problem?

Which actor had the fourth wedding in the movie Four Weddings and a Funeral?

What was the complete name of the toga party band from the movie "Animal House"?

In what year was Billy the Kid born?

Which country do you associate with the Easter Rising?

What was the last imperial dynasty of China?

With what global issue does the 2016 Paris Agreement deal with?

Who was the Greek god of sleep?