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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

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Video: Inflammation

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