Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are more bacteria in your mouth than there are people in the world.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
How to set up and solve linear models (Question 3)