The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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The average adult has about 21 square feet of skin.