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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Embryo and fetal development during weeks 1–25 of gestation. Embryo and fetal development during weeks 1–25 of gestation.
Super's Five Stages of Career Development Super's Five Stages of Career Development
Drug development time line. Drug development time line.
Tornado Formation: Nonsupercell Tornado Development Tornado Formation: Nonsupercell Tornado Development
Development of the skull Development of the skull
Stages of development in vertebrates. Stages of development in vertebrates.
Video: Morphology of a tomato plant

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