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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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In 1864, the first barbiturate (barbituric acid) was synthesized.