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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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The familiar sounds of your heart are made by the heart's valves as they open and close.