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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Blood is approximately twice as thick as water because of the cells and other components found in it.