Blood is approximately twice as thick as water because of the cells and other components found in it.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Three views of neurulation in an amphibian embryo
Two views of the phylogenetic relationship between Neandertals and modern H. sapiens.