Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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There are 20 feet of blood vessels in each square inch of human skin.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
