Title: Dutch language.
Question: What case no longer used in Dutch is still present in German phrases like "Der Herr des Hauses"?

Title: Detroit.
Question: What Kiss song gave Detroit the nickname Rock City?

Title: History of India.
Question: In what century did the Chola Empire emerge?

Title: Light-emitting diode.
Question:
Why is efficiency sometimes lost in phosphor-based LEDs?