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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
The human body produces and destroys 15 million blood cells every second.
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.