Which commodity made John D. Rockefeller very wealthy?

What is 'a substance that initiates or accelerates a chemical reaction without itself being affected'?

In which month of 1939 did Germany invade Poland and spark off World War 2?

Old Woman Frying Eggs' was a 17th century painting by which Spanish artist?

If you can seize and sell goods to cover a debt owed, what is your job?

Which golfer, in 1997, became the youngest ever winner of the Masters?

Which of these enables cats to come in and out of a house?