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

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Your heart beats over 36 million times a year.

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Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

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The longest a person has survived after a heart transplant is 24 years.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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