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Did you know?

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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

During the Pullman strike in Chicago, workers protesting wage cuts did $340,000 in property damage, During the Pullman strike in Chicago, workers protesting wage cuts did $340,000 in property damage,
Decremental property of graded potentials. Decremental property of graded potentials.
Prestige can sometimes be converted into property. Shown here is “Snooki” Polizzi, a reality ... Prestige can sometimes be converted into property. Shown here is “Snooki” Polizzi, a reality ...
How to multiply any two or more radicals How to multiply any two or more radicals
How to add, subtract, multiply, and divide using the rules of significant digits (Part 1) How to add, subtract, multiply, and divide using the rules of significant digits (Part 1)
Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply
Video: Anaphylaxis Animation

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