Title: Spanish language in the United States.
Question: Why did Central Americans flee to the U.S.?

Title: Melbourne.
Question: What are the only forms of public transport to and from the city's main airports?

Title: Adolescence.
Question: The appearance of more systematic, abstract thinking is a notable aspect of what type of development during adolescence?

Title: Poultry.
Question:
How many ducks did China produce for consumption in 2011?