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Author Question: Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m ... (Read 2132 times) |
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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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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Everyone has one nostril that is larger than the other.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.