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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).
The longest a person has survived after a heart transplant is 24 years.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
There are approximately 3 million unintended pregnancies in the United States each year.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.