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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
The longest a person has survived after a heart transplant is 24 years.
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