Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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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.
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The longest a person has survived after a heart transplant is 24 years.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Bay (left) and chestnut (sometimes called "sorrel") are two of the most common coat colors
Arthroscopic surgery. In this illustration, the knee joint is undergoing surgery with a specialized
A resonance tube, called a Helmholtz resonator, is used on the intake duct between the air filter ...
Site of action of diuretics.
A thin cleft, called the synapse, separates one cell from another.