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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
Blood is approximately twice as thick as water because of the cells and other components found in it.