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

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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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