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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).
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
Medication errors are three times higher among children and infants than with adults.
Blood is approximately twice as thick as water because of the cells and other components found in it.