Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
Apparent and True Orbits of Alpha Centauri.
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Prison
Sample Exercise Program for Limited Older Adults (cont.)