Which dystopian novel by George Orwell includes the phrase "Big Brother is watching you"?

1984

Which disciple died first as a martyr among the apostles in the Book of Acts? Which city hosts the traditional rowing event known as 'The Boat Race'? What was the first country to issue a Christmas postage stamp? Phoebe's apartment catches fire due to burning what particular object? What is the female Inkling idol duo featured prominently in Splatoon 2 called?