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Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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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.

The primary structure of ribonuclease The primary structure of ribonuclease
The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper
Primary Motor Cortex and Seizures Primary Motor Cortex and Seizures
Carbon dioxide: The anthropogenic greenhouse gas of primary concern Carbon dioxide: The anthropogenic greenhouse gas of primary concern
Primary factors affecting blood pressure Primary factors affecting blood pressure
Frontal section of primary somatosensory area in right cerebral hemisphere Frontal section of primary somatosensory area in right cerebral hemisphere
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