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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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