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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).
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
The FDA recognizes 118 routes of administration.