There are 60,000 miles of blood vessels in every adult human.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Excessive alcohol use costs the country approximately $235 billion every year.
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The longest a person has survived after a heart transplant is 24 years.
The birth weight of human infants is tightly constrained by natural selection.
This father is serving as a secure base for his infant.