Here's why inauguration day occurs months after an election.
Will President Trump be impeached? Here's a look at what impeachment means, how it works and who has been impeached.
A coup d'état, which translates as "stroke of the state," can be triggered by military actions, the involvement of foreign governments, or popular revolts.
The 25th amendment clarifies the steps to be taken if the offices of president or vice president become vacant.
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?