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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.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.