What gas is exhaled by humans?

More Questions:

Which floor of the Guinness Storehouse houses the Gravity Bar, where tourists can drink a pint of Guinness?

What sports team used the Swinging Friar as its team emblem until 1984?

What gift is first presented on the fifth day in the song "The Twelve Days of Christmas"?

Which country's capital city lies on the River Aar?

A camel's hump contains mostly what?

What is a characteristic of a "nimbus" cloud?

What tree gives us prunes?

Who developed the world's first vaccine?

What animated film begins in Shiverpool, Antarctica?

Who was Larry Sanders" sidekick on "The Larry Sanders Show"?

Which towering professional wrestler passed away on January 27, 1993?

Craig Phillips was the first winner of the UK version of which TV reality show?

Who sang the song "Californication"?

Who is Jamie Lee Curtis" mother?

What is the capital of Togo?