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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

The life cycle of a flowering plant, illustrated by the genus Polygonum The life cycle of a flowering plant, illustrated by the genus Polygonum
Animal life cycles Animal life cycles
Apply lotion to the arm from hand to shoulder. Use moderate pressure. Feel the quality of the ... Apply lotion to the arm from hand to shoulder. Use moderate pressure. Feel the quality of the ...
Healthy eating is a way of life Healthy eating is a way of life
Labour economics Labour economics
Video: Osteoporosis

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