Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are 20 feet of blood vessels in each square inch of human skin.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
In addition to common schools, thousands of female seminaries were built between 1820 and 1850, many
Progression Graph: Fitness Plan
Olmsted, Vaux & Co., General plan of Riverside, Illinois.