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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
The horizontal fraction bar was introduced by the Arabs.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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