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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

The theoretical design of nature reserves, based on the tenets of island biogeography. The theoretical design of nature reserves, based on the tenets of island biogeography.
Structures of the Abdomen: Anterior View Structures of the Abdomen: Anterior View
Sheep brain Sagittal view Sheep brain Sagittal view
Lateral View of the human brain in cross section Lateral View of the human brain in cross section
After Pierre Courvoisier, View of Père Lachaise Cemetery from the Entrance. After Pierre Courvoisier, View of Père Lachaise Cemetery from the Entrance.
Dermatomes of body, anterior view Dermatomes of body, anterior view
Video: Bone processes - resorption and deposition, remodeling and response to stress in adult bones

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