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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
The familiar sounds of your heart are made by the heart's valves as they open and close.