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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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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

