Title: Infrared.
Question: Along with a chemical process, what type of process is used by night vision devices to convert infrared into visible light?

Title: Association football.
Question: What is the age limit on the Olympic men's tournament?

Title: Portugal.
Question: What tourist destinations are the Portuguese government continuing to promote and develop?

Title: Financial crisis of 2007%E2%80%9308.
Question:
In a Federal Reserve survey of 4,000 households, what percent reported wealth decline between 2007 and 2009?