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If you could remove all of your skin, it would weigh up to 5 pounds.

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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

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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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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Three ways that factors affect mortality in response to changes in population density. Three ways that factors affect mortality in response to changes in population density.
W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared
Factors Affecting the Environmental Lapse Rate (ELR): Heating or Cooling of the Lower Atmosphere Factors Affecting the Environmental Lapse Rate (ELR): Heating or Cooling of the Lower Atmosphere
Major regulatory factors controlling pyruvate dehydrogenase and the citric acid cycle Major regulatory factors controlling pyruvate dehydrogenase and the citric acid cycle
Factors Affecting the Affinity of Hb for O2 Factors Affecting the Affinity of Hb for O2
Other Endocrine Tissues and Organs, Eicosanoids, and Growth Factors Other Endocrine Tissues and Organs, Eicosanoids, and Growth Factors
Video: Requirements for nervous signals

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