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The horizontal fraction bar was introduced by the Arabs.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.