Title: Incandescent light bulb.
Question: When was this style of lamp developed?

Title: Light-emitting diode.
Question: The narrowing of the emission spectrum in Quantum Dot LEDs allows them to do what?

Title: Printed circuit board.
Question: In what year was the Auto-Sembly process created?

Title: Catalan language.
Question:
What are Catalan and Valencian considered to be in the language?