An amendment to the US Constitution must be ratified by what fraction of all the states?

More Questions:

The 2007 rule banning suspended NFL players from signing with the CFL was named for what player?

What sports figure was known as "The Wizard of Westwood"?

What year was Charles Darwin's work, "On the Origin of Species', published?

On which river is the Kariba Dam?

Which planet was originally known as the Georgian Star?

Which Russian scientist used dogs to study conditioned reflexes?

What poison is known for having the aroma of bitter almonds?

What cooking fuel is produced by heating wood without oxygen?

In the TV show "The Simpsons', what is the name of the comic book store?

What classic sitcom character was played by Irene Ryan from 1962 to 1971?

What year was Theodore Roosevelt born in?

What civilization worshiped a feathered serpent called Quetzalcoatl?

What character was invented to respond to questions from Gold Medal Flour customers?

In which 1949 film does Alec Guinness portray nine members of the D'Ascoyne family?

In which US city would you find the Space Needle?