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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 stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.