The human body produces and destroys 15 million blood cells every second.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The longest a person has survived after a heart transplant is 24 years.
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Evolution of the Sun's luminosity, radius and effective temperature compared to the present Sun
Semi-circle bridge
A hyfrecator, an electrocautery unit.
Orientation and structure of a nephron, the functional unit of the kidney.