Title: The Blitz.
Question: In 1940 what percentage used the Tube for a sleeping shelter?

Title: Portugal.
Question: On what charge was BPN's CEO arrested?

Title: Molotov%E2%80%93Ribbentrop Pact.
Question: Which two countries positioned themselves to broker an new trade agreement?

Title: On the Origin of Species.
Question:
What were William Thomson's reasons for disputing Darwin's estimate?