Excessive alcohol use costs the country approximately $235 billion every year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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On average, the stomach produces 2 L of hydrochloric acid per day.
The Scale of Life 1
Landmarks in the evolution of life on Earth
Life Expectancy in Global Perspective
Half-life Formula
Animated The one-way flow of energy and cycling of materials in the world of life