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Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.