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Author Question: The part of the brain that enables a child to sustain attention becomes increasingly myelinated ... (Read 35 times) |
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.