Title: Spanish language in the United States.
Question: Why did Venezuelans come to America?

Title: Light-emitting diode.
Question: What does the multi-color white LED method need to produce the end result?

Title: Botany.
Question: How can historical changes in the environment be detected?

Title: High-definition television.
Question:
Which European country first deployed HD content using the new DVB-T2 standard?