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Did you know?
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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.