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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.