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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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).
![Young boy with characteristic nasal crease from the repeated action of the “nasal salute” caused ...](https://biology-forums.com/gallery/47/medium_2137_18_05_12_3_17_20.jpeg)
![Cushing’s syndrome. A photograph of a woman with the characteristic facial features of Cushing’s syn](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_43_57_82421002.jpeg)