Title: Korean War.
Question: What army did North Koreans serve in during the civil war?

Title: Frederic Chopin.
Question: Whose piano method did Chopin teach his students?

Title: Jehovah%27s Witnesses.
Question: How long ago was the foundation of the Jehovah's Witnesses movement?

Title: Botany.
Question:
What have scientists learned about angiosperms from DNA sequencing?