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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Types of muscle Types of muscle
Bone fractures that occur before death show signs of healing. The process of fracture healing starts Bone fractures that occur before death show signs of healing. The process of fracture healing starts
The distribution of the sarcoplasmic reticulum and tubules around myofibrils of skeletal muscle. The distribution of the sarcoplasmic reticulum and tubules around myofibrils of skeletal muscle.
Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone. Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone.
The regulation of muscle contraction by calcium The regulation of muscle contraction by calcium
bunny muscle bunny muscle
Video: Phases of the ovarian cycle

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