Sustainable sources of energy are renewable and are generally less harmful to the environment than fossil fuels.
According to the New Testament, the Star of Bethlehem led the three wise men to Jesus' birth. Here are a few theories about what the star really was.
Carl Linnaeus, the famous 18th century Swedish botanist, created the basic foundation on which the modern binomial classification system is based.
The term transgender describes people whose gender identity differs from the sex to which they were assigned at birth.
Margaret Thatcher was Britain's first woman prime minister, and one of the country's most controversial figures.
Prince Charles and Diana's engagement and wedding captured the world's attention, but it wasn't as perfect as it appeared.
Cytokines help the immune system kill pathogens, but too many cytokines can lead to bad health outcomes and may turn into a "cytokine storm."
If the fisher cat isn't the most inaccurately named animal in North America, it's certainly up there: It's not a cat, and it doesn't care much for fishing.
The Republicans used to favor big government, while Democrats were committed to curbing federal power. How did the parties switch stances?
Halloween has its roots in a pagan harvest festival, while different traditions were added throughout the years.
RNA keeps some of life's most important processes humming, from building your body's proteins to silencing genes.
Eating healthily isn't a bad thing, but taken to the extreme, it can turn into a disorder called orthorexia nervosa.
The Black Panther Party was a revolutionary socialist organization that demanded equal rights for Black people and Black communities.
Hurricanes and typhoons — or more broadly, tropical cyclones — begin as clusters of thunderstorms over tropical ocean waters, taking anywhere from several hours to days to become organized.