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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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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.

Goblet cells that line the intestine Goblet cells that line the intestine
This Black-browed Albatross has been hooked on a long-line. This Black-browed Albatross has been hooked on a long-line.
Scaling the Earth down to the size of a basketball, the Moon is roughly the size of a tennis ball. T Scaling the Earth down to the size of a basketball, the Moon is roughly the size of a tennis ball. T
Time Line of Human History From Upper Paleolithic Period to the Present Time Line of Human History From Upper Paleolithic Period to the Present
A mechanical returnless fuel system. The bypass regulator in the fuel tank controls fuel line ... A mechanical returnless fuel system. The bypass regulator in the fuel tank controls fuel line ...
Redi Experiment Redi Experiment
Video: Mechanisms for chromosome movement Animation

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