What decade introduced barcode scanners to supermarkets?

More Questions:

How many total combined red and black numbers are there on a roulette wheel?

What is the capital of Kyrgyzstan?

What is the largest lake lying completely inside Canada?

The Yellow River is what country's second longest?

Which country's cuisine includes the dish called "bibimbap"?

What are the six most abundant Greenhouse Gases?

What two-word term is the top speed reached by a free-falling object?

Which 1979 film featured a space ship named "Nostromo"?

Whose series of thirteen children's books of thirteen chapters each ended in 2006 with "The End"?

What disappeared from the town of South Park, forcing Randy to relocate his family to a refugee camp in California?

Which "Family Guy" character is paralyzed from the waist down?

What was Ward Cleaver's occupation on the TV show "Leave it to Beaver"?

The Kenyan terrorists fighting for independence in the 50’s were known as who?

When did the Panama Canal open?

Which city was the first ever to host the Olympic Games twice?