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Did you know?

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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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Evolutionary adaptation to a new environment via natural selection. Evolutionary adaptation to a new environment via natural selection.
Many types of edible fungi are grown for the market. Many types of edible fungi are grown for the market.
Target Organ Effects Target Organ Effects
Evidence of natural selection: Canis lupus familiaris Evidence of natural selection: Canis lupus familiaris
Natural plant sources of pharmaceutical Natural plant sources of pharmaceutical
Natural hazards Natural hazards
Video: Introduction to Autism

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