Which American activist became famous for improving working conditions for coal miners and child laborers in the early 1900s, earning the nickname 'Mother'?

Mother Jones

Who created the world of Westeros for the "Game of Thrones" saga? Who sings the song "Hotline Bling"? Who lives at Number 4 Privet Drive? What's the name of the error identified in the proof of Russell's Paradox? Who got swallowed by a giant fish?