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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.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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Video: Primate Evolutionary Tree Animation

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