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SPF stands for Sun Protection Factor.

Symptoms of depression can include: depressed or irritable mood, poor concentration, insomnia, changes in appetite, and loss of interest.

Skin is the largest organ of the human body, in terms of both weight, between 6 and 9 pounds, and surface area, about 2 square yards.

In psychology, memory is an organism's mental ability to store, retain and recall information.

Dermatology is the branch of medicine that deals with conditions of the skin.

Skin is composed of 3 primary layers: the epidermis, the dermis, and the hypodermis.

Humans usually have 20 primary teeth (also called deciduous, baby, or milk teeth) and 32 permanent teeth.

Childbirth usually occurs about 38 weeks after conception, i.e., approximately 40 weeks from the last normal menstrual period (LNMP) in humans.

The National Health Service recommends that overall weight gain during the 9 month period of pregnancy be 22–26 pounds.

Exercise, particularly aerobic exercise, is an effective cheap treatment for erectile dysfunction.

Loss of memory is known as amnesia.

Short-term memory allows recall for a period of several seconds to a minute without rehearsal.

Dental caries, also described as ""tooth decay"" or ""dental cavities"", is an infectious disease which damages the structures of teeth.

Memory may be improved via simple lifestyle changes such as memory exercises, healthy eating, physical activity, and stress reduction.

Rapid eye movement sleep, or REM sleep, accounts for 20–25% of total sleep time in normal human adults.

Most memorable dreaming occurs in rapid eye movement (REM) sleep.

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