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Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
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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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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.