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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.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Vaccines prevent between 2.5 and 4 million deaths every year.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.