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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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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.

Patients with physical special needs, such as a wheelchair, need to have this documented in their he Patients with physical special needs, such as a wheelchair, need to have this documented in their he
Age at First Sign of Psychotic Symptoms in Schizophrenic Patients Age at First Sign of Psychotic Symptoms in Schizophrenic Patients
It may be difficult for patients to get the vital minerals they need from their diets, so ... It may be difficult for patients to get the vital minerals they need from their diets, so ...
A food diary can help patients identify unhealthy eating habits and make healthy choices. A food diary can help patients identify unhealthy eating habits and make healthy choices.
Split-brain patients were shown composite photographs Split-brain patients were shown composite photographs
A simplified overview of the genes and regulatory units involved in the control of lactose metabolis A simplified overview of the genes and regulatory units involved in the control of lactose metabolis
Video: Pores and Ion Channels

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