Copenhagen is the world's greenest city. Learn more about how they got there, and what the city is doing to combat climate change.

Not quite an asteroid, not quite a planet: the dwarf planet Ceres is filled with mysteries and the space probe Dawn is on a mission to uncover them.

If international travel isn't in your budget; fear not: there are plenty of gorgeous natural wonders in the United States.

Thomas Edison's invention brought forth a new era for cities and humanity at large. But it also brought a negative externality that continues to plague Earth: light pollution.

McDonald's is losing US market share among fast food restaurants. If it brought these international items home, they might do a little better.

The day is known for its capitalization of love and intimacy, but these Valentine's Day murders paint the holiday in a macabre light.

Makeup hasn't always been easy and breezy -- just ask the Romans.

Everyone has heard about Amelia Earhart. These female aviators are equally worthy of your admiration.

Believe it or not, the selfie is not unique to our times--it's just become more democratized.

The world's greenest cities are doing their part to reduce global temperatures' ascension into the red. Which cities do you think are leading the way?