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The horizontal fraction bar was introduced by the Arabs.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.