Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event