Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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A person will create enough saliva to fill two average size swimming pools during his lifetime.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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It takes approximately 12 hours for food to entirely digest.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The human eye blinks an average of 4,200,000 times a year.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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