Q: Who in 2012 made the first submarine solo dive to the bottom of the Mariana Trench, the lowest point of the oceans (subsequently to release a 3D film of the dive)?
A: james cameron

Q: Except for a short break from 1492 to 1512, which merchant family effectively ruled Florence from the 13th century to 1737?
A: medici

Q: In which district of London would you find Harrods department store?
A:
knightsbridge