There are 60,000 miles of blood vessels in every adult human.
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The human body produces and destroys 15 million blood cells every second.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
Furchgott's discovery that endothelial cells produce a vasodilating substance.
Carnivorous plants, such as this pitcher plant (Sarracenia purpurea) are commonly found in bog habit