Title: Light-emitting diode.
Question: What type of diode was used to help discover near-infrared light emission?

Title: Military history of the United States.
Question: What is the name of the naval base the US leased from a newly independent Cuba?

Title: Samurai.
Question: When did Shiba Yoshimasa die?

Title: Economy of Greece.
Question:
What did the Deutsche Bank estimate the value of the reserves to be at?