Problem: Phobos and Diemos are the moons of which planet in our solar system?
Answer: mars

Problem: Which Cairo square was the centre of the Egyptian revolution?
Answer: tahrir square

Problem: During Prime Minister's Questions at the House of Commons in December 2008 Gordon Brown amusingly and accidentally claimed his government had saved what? (instead of the banking system)
Answer: world

Problem: Now named Apatosaurus, which huge dinosaur, known more famously by its previous name, took its name from the phrase 'Thunder Lizard'?
Answer:
brontosaurus