What defined as "the ratio between a circle's circumference and its diameter"?

More Questions:

In which US state is the General Sherman Tree located?

What kind of birds would you find in a gaggle?

The Houston Comets won what league's first ever championship title?

What year did the US host their first Olympic Games?

On what planet was Superman born?

Which artist did Matisse and Picasso call "the father of us all"?

What US city's skyline boasts the Gateway Arch?

Which US state is home to the Odessa Crater?

In which US state can you find permafrost?

What object marks the geographic South Pole?

Gregory Peck played Lt. Joe Clemons in what 1950s film?

Who starred as Colin Hanks" brother in the 2002 movie "Orange County"?

Which US president was better known as "Ike"?

What city in Idaho was the first in the world to use electricity generated by nuclear power?

What was Richard Wagner's second Opera that was inspired by a trip on the sea?