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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).
Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
There are more nerve cells in one human brain than there are stars in the Milky Way.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.