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The familiar sounds of your heart are made by the heart's valves as they open and close.
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).
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
Asthma cases in Americans are about 75% higher today than they were in 1980.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.