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Did you know?
A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.