The seasonal flu shot is a yearly vaccine administered to protect against the flu, or influenza. In the United States, flu shots are recommended for everyone ages 6 months and older.
On Feb. 23, 1945, six Marines raised the U.S. flag over the Japanese island of Iwo Jima. Their photo is one of the most iconic images of World War II.
Mary Anning's discoveries shocked the 19th-century scientific establishment. But her gender, poverty and lack of formal education meant she often didn't get credit for her work.
Fought on a tiny volcanic island 76 years ago, this brutal clash between American and Japanese forces defined the horror of the Pacific theater.
This political activist and minister challenged the conventions of race and religion during the early years of the civil rights movement.
What we know about the history and properties of "Einstein's biggest mistake," the cosmological constant
Blame plate tectonics for Earth’s mountains, earthquakes, volcanoes, and why its continents fit together like pieces of a giant jigsaw puzzle.
You may think of the global population as a massive, exponentially-growing number of people that threaten to use up all of the world's resources, but that's not the case.
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.