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The color of your hair, your age, and even your gender have an impact on how many hairs are on your head. These modifiers even have a say in the denseness, and rate of growth of your hair. For example male hair is more dense than female hair, and females hair grows slower than males.
http://www.hairboutique.com/tips/tip1412.htm
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“In humans and other hemoglobin-using creatures, oxygenated blood is a bright red in color. Deoxygenated blood is a darker shade of red, which can be seen during blood donation and when venous blood samples are taken. However, due to an optical effect caused by the way in which light penetrates through the skin, veins typically appear blue in color. This has led to a common misconception that before venous blood is exposed to air it is blue.”
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