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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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The longest a person has survived after a heart transplant is 24 years.
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The human body produces and destroys 15 million blood cells every second.
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A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.