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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
There are more nerve cells in one human brain than there are stars in the Milky Way.
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