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Bipolar disease. The term bipolar means “pertaining to two poles.” The individual with this form of
Continuous positive airway pressure (CPAP) device. The sleeping subject is receiving the benefits of
Achondroplasia. The individual in this photograph has the reduced limb development that typifies thi
This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p
The Inverted Income Pyramid: The Proportion of Income Received by Each Fifth of the U.S. Population
Niche: An individual’s ecological role