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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.