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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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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.