The Gregorian calendar — used by most of the world — was introduced to fix errors in the Julian calendar mostly having to do with leap years.
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.
One of the main risks of this rare blood disorder is internal bleeding into muscles, joints and soft tissue.
Fought on a tiny volcanic island 75 years ago, this brutal clash between American and Japanese forces defined the horror of the Pacific theater.
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.
Megalodon was the largest shark and one of the largest fish on record. It went extinct about 2.6 million years ago.
Jerusalem is the epicenter of several of the world's major religions, but its importance is much more than just spiritual.
Anemia is a common condition that may be caused by a shortage of iron, abnormal bleeding, infections, cancer or gastrointestinal problems.
The global increase in carbon dioxide emissions is not only warming our planet at an alarming rate, but it's also making our oceans more acidic.
This parasitic infection hijacks rodent brains and infects people through dirty cat litter. There's a good chance you have it.
Neuroblastoma is a rare form of childhood cancer that occurs when early forms of nerve cells don't develop correctly.
Your body might fall apart were it not for collagen. Good thing a healthy body naturally produces all the collagen it needs.
The amygdala is often referred to as the "fear center" of the brain — but this name hardly does justice to the amygdala's complexity.
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