Title: Richard Feynman.
Question: What science displicine did Feyman encourage his sister to study?

Title: Umayyad Caliphate.
Question: At what battle did the Hindus of India defeat the Umayyads?

Title: Wood.
Question: What is the living wood in a tree called?

Title: Molotov%E2%80%93Ribbentrop Pact.
Question:
Where did the Nazi and Russian leaders meet to discuss what to do with Poland?