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There are 60,000 miles of blood vessels in every adult human.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.