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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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The longest a person has survived after a heart transplant is 24 years.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.