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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.