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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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The average office desk has 400 times more bacteria on it than a toilet.

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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

The internal organization of cells, tissues, organs, and organ systems in a mammal. The internal organization of cells, tissues, organs, and organ systems in a mammal.
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Negative feedback control of the female reproductive hormones Negative feedback control of the female reproductive hormones
Procedures and Diagnostic Tests Related to the Female Reproductive System Procedures and Diagnostic Tests Related to the Female Reproductive System
From Cells to Organs and Organ Systems From Cells to Organs and Organ Systems
Autonomic innervation of the male reproductive system Autonomic innervation of the male reproductive system
Video: Buffers definition and the role of buffer in the body

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