Countries With the Most Immigrants as a Percent of Continent

Name the twenty countries whose residents have the lowest median age.

Try to name the countries that have the greatest number of active military troops.

Name the 20 cities ranked as the world's top financial centers according to the Global Financial Centres Index.

Evil aliens have decided to kill everyone on Earth! Fortunately, they've given you two minutes to save as many as you can. All you have to do is name a country to save everyone in it.