The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Cyanide works by making the human body unable to use oxygen.
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There are more sensory neurons in the tongue than in any other part of the body.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
teaching children about some of the world’s environmental problems
One-point linear perspective.
Child influences on parents, parenting influences on children, and influences of the marital ...
School-age children enjoy classifying objects
Literacy Development in the Early Years: Helping Children Read and Write