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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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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.