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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.