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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Vaccines prevent between 2.5 and 4 million deaths every year.
The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.