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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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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

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Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

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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.

Steps involved in in vitro fertilization. Steps involved in in vitro fertilization.
Brain scans showing the white-matter pathways involved in everyday learning: Brain scans showing the white-matter pathways involved in everyday learning:
Many European Americans are involved in ethnic work, attempting to maintain an identity more precise ... Many European Americans are involved in ethnic work, attempting to maintain an identity more precise ...
Bile duct system of the liver and gallbladder. Bile duct system of the liver and gallbladder.
Piaget's research involved several kinds of conservation tasks Piaget's research involved several kinds of conservation tasks
Types of cells involved in the inflammatory response Types of cells involved in the inflammatory response
Video: Introduction to Sickle Cell Anemia

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