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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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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

Vitamin D Pathway' Vitamin D Pathway'
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Video: Contraction cycle of a sarcomere

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