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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Blood is approximately twice as thick as water because of the cells and other components found in it.
All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.