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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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The horizontal fraction bar was introduced by the Arabs.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.