The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Sources and Amounts of Oil Released into North American Marine Waters
French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
The universal choking sign.
Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus
Animals and Language (1 of 2)
North American temperate deciduous forest. Forest soil profile at right.