The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The longest a person has survived after a heart transplant is 24 years.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Thymus gland. (A) Appearance and position; (B) with anatomic structures.