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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Relationships among major invertebrate lineages
Major fluid compartments in the body
Major Events in the History of Psychology (6 of 6)
Major Degenerative Diseases of the Central Nervous System
Outline of pathways for glucose synthesis from the major gluconeogenic precursors