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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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There are more sensory neurons in the tongue than in any other part of the body.
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Thyroid conditions may make getting pregnant impossible.
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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.