Senescence

Biologically speaking, senescence is the process of deterioration that follows the development of an organism. In 1965, Leonard Hayflick discovered that normal diploid cells divide in cell culture about 50 times before entering a senescence phase during which they can replicate no more. Each cell division shortens the telomere of the cell’s DNA, thus ticking […]

Age is Just a Number

Jeanne Louise Calment, who died at 122 years and 164 days of age, lived to be the oldest person on record. Though her parents and siblings also lived to an advanced age, she outlived them all. An active woman, Calment continued to ride a bicycle until she was 100 years old and lived independently until […]

lentigo

Definition: (noun) A small, flat, pigmented spot on the skin. Synonyms: freckle. Usage: The dermatologist advised the patient to keep an eye on the large lentigo near her lip and to alert him if there was a change in its size or shape. Discuss …read more

Polymers

Both DNA and plastic, two seemingly unrelated materials, are classified as polymers, compounds of usually high molecular weight consisting of a number of structural units linked together by covalent bonds. A diverse assortment of natural and synthetic materials comprises the class of polymers, including hair, polyester, and shellac. Polymers are even used in the production […]

comedo

Definition: (noun) A plug of keratin and sebum within a hair follicle that is blackened at the surface. Synonyms: blackhead. Usage: On the morning of the school dance, she was dismayed to discover a large comedo on her chin. Discuss …read more

pyrosis

A painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder. Usage: Even after he swore off spicy foods, his pyrosis kept him up at night. …read more See Also Heartburn

Pica

Characterized by the consumption of materials such as soil, chalk, and hair, pica is a disorder involving an appetite for non-nutritive substances or an abnormal compulsion to eat foodstuffs that are usually ingredients, such as flour or starch. Such eating behaviors have been observed in people of all ages but are only termed pica if […]

Synchronicity

A term coined by psychologist Carl Jung to describe what he called “meaningful coincidences,” synchronicity is the experience of two or more causally unrelated events that are conceptually similar and have very little chance of occurring together randomly—such as the discovery of the same idea by two different people at approximately the same time. Although […]

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