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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Primary factors affecting blood pressure Primary factors affecting blood pressure
The Warm Mineral Springs individuals from Florida may be among the earliest Paleo-Indian skeletal re The Warm Mineral Springs individuals from Florida may be among the earliest Paleo-Indian skeletal re
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Video: Digestion Animation

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