The 20-year mission of a U.S. military weather satellite came to an abrupt end last month after a power system temperature spike and an apparent explosion.
It's the fifth-most populous country on the planet as well as Latin America's most influential nation. Just how powerful is Brazil?
Will the spread of autonomous, death-dealing aircraft lead to peace and stability, or more civilian casualties?
High-tech devices can help or hinder the shot.
NBC News anchor Brian Williams has apologized for telling a story that wasn't true. But psychologists have suggested it may not be a lie.
With the size of its economy and its high-tech military, the United States is generally considered the most powerful nation on Earth. But how long can it remain that way? Trace explains the limitations that curb U.S. power.
This nation surrounded by water patrols its coastal seas with a defense force and is strong relative to its geographic neighborhood, but it's a bit more modestly powerful in global terms. Trace explains.
It might sound surprising, given the world's troubled times, but there are currently 23 countries that don't employ an active military. Find out how they get by in an increasingly violent 21st century.
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