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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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).
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.