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There are more nerve cells in one human brain than there are stars in the Milky Way.
Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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.