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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Cyanide works by making the human body unable to use oxygen.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.